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Four men have been arrested on suspicion of terrorism offences in a series of raids, during which one suspect was Tasered.
The men - all aged 20 or 21 - were detained by officers from the Metropolitan Police's Counter Terrorism Command at addresses across London as part of an investigation into Islamist terror activities.
Officers believe the raids disrupted what could have been a "significant plot", according to a Whitehall source quoted by the Press Association.
The 21-year-old who was Tasered during his arrest did not require medical treatment, Scotland Yard said.
"SO15 officers were assisted in the execution of warrants at one of the addresses by officers from the Specialist Firearms Command (SCO19). No shots were fired," police said in a statement.
"A number of residential addresses and vehicles are being searched by specialist officers in west and central London as part of the investigation. The searches are ongoing.
"These arrests and searches are part of an ongoing investigation into Islamist-related terrorism."
All four suspects have been taken to police stations in central London and remain in custody.
Sky News correspondent Mark White explained: "The information that we're getting from sources suggests that this was an early disruption of what might have been a significant plot had it been allowed to come to fruition.
"There has been a change in recent months in the way that the authorities will approach these plots... the authorities no longer have the luxury of following a terror group that might be buying the ingredients for an explosive device and conspiring among themselves for many months.
"These plots can spring up so quickly that the police have to intervene at a very early stage and that might mean that, at the end of the day, they don't get enough evidence that they can put before the court.
"But that's the trade off - disrupting plots and safeguarding the public at the expense, perhaps, of a trial further down the line."
Nick Clegg says his party has been tainted by time in Government and pledged never to make a tuition fees-style "mistake" again.
In his final conference speech before the General Election, the Liberal Democrat leader admitted he was no longer the "untainted ... fresh-faced outsider" who rode into the coalition on the back of "Cleggmania" in 2010.
Mr Clegg accused the Conservatives of lurching right and Labour of lurching left to combat the threat of UKIP, claiming the middle ground for his party ahead of the vote in May.
He thanked Ed Miliband for forgetting to mention the deficit and he thanked the Chancellor George Osborne for announcing he would take away benefits from working age poor - making the party's job easier.
Mr Clegg said the Liberal Democrats were the only party to stand for "decent British values" and against the politics of "blame and grievance and fear" on offer from the other parties and he would "keep hammering away at the system every single day".
And he said he had debated UKIP's Nigel Farage on the European Union because someone had to stand up for "liberal Britain".
The Deputy Prime Minister listed all of the Lib Dems' triumphs while in Government including increasing the personal tax allowance - effectively awarding tax cuts to millions - free childcare, better parental leave, gay marriage, and the pupil premium for disadvantaged children.
And he said he wouldn't stand by and see the Tories claiming the credit for all the Liberal Democrats had done while in Government telling activists: "David Cameron you can copy our ideas but you will never imitate our values."
Mr Clegg vowed to increase the personal tax free allowance to £11,000 by 2016 and £12,500 by 2020.
He accused the Conservatives of plagiarising Liberal Democrat policy with David Cameron's conference pledge increase the amount people can earn without being taxed to £12,500 by 2020, which would mean a tax cut for 30 million people.
Increasing the personal allowance was part of the Liberal Democrats' manifesto pledge in 2010 but in the televised leaders debates Mr Cameron told Mr Clegg his plans were unaffordable.
Mr Clegg disclosed a conversation with Mr Osborne in which the Chancellor told him: "I don't want to deliver a Liberal Democrat budget"
In his speech, Mr Clegg also hit back at Home Secretary Theresa May accusing her of "playing on people's fears simply to try and get your own way".
In her speech to the Tory conference last week, Mrs May accused the Lib Dems of putting children's lives at risk by opposing measures that would allow intelligence agencies access to all phone, internet and email records.
Mr Clegg said: "Your Communications Data Bill was disproportionate, disempowering - we blocked it once and we'd do it again.
"There are times when the state needs to keep its nose out of our lives, to give us the freedom to make the most of our lives. There are times when the state needs to extend a helping hand so that everyone can make the most of their lives. That is a smart, liberal, enabling state."
He also had a rebuke for Mr Cameron over his attitude to environmental policies telling party activists: "It's not green c*** to us" as he made a manifesto pledge to five new green laws.
The Prime Minister was reported last year to have said: "We've got to get rid of all this green c***."
Mr Clegg also promised the vow on the devolution of powers to Scotland promised by the three party leaders would not be broken.
And he paid tribute to the two Britons killed by Islamic State terrorists saying their deaths had provided British forces in Iraq with a "clear, single objective".
He also announced there would be national waiting times for mental health patient and, like Mr Cameron and Mr Miliband, he pledged to increase spending on the like DNHS.
The Spanish nurse being treated for ebola says she touched her face with a tainted protective glove after helping treat a man dying from the virus.
Theresa Romero, 40, is in quarantine in a Madrid hospital but told doctors she believes she made the mistake after cleaning up after the man.
Heath officials said she had twice entered the room of Spanish missionary Manuel Garcia Viejo - once to change his incontinence pad and then to retrieve items after he had died.
Mrs Romero is the first person to contract the virus outside Africa.
She earlier told El Mundo she had no idea how she was infected and that she had followed all precautions.
Another three people are also quarantined at the Carlos III hospital, including the woman's husband - who has made a video appeal for authorities not to destroy the couple's dog.
Some 50 other people - who either had contact with Mrs Romero or treated one of the two missionaries who died at the hospital - are also being monitored.
Spanish leader Mariano Rajoy has called for calm and promised "transparency" over the scare, which has raised questions over whether strict safety rules were properly followed.
As West Africa struggles to cope with a spiralling infection rate, burial teams in Sierra Leone have reportedly gone on strike.
The workers, who arguably have one of the world's most dangerous jobs, complain they have not been paid.
The situation is "very embarrassing", said health ministry spokesman Sidie Yahya Tunis.
He promised money was available for the workers.
"We haven't been paid for two weeks, so we need our money right now," said one angry worker.
"We don't even care if dead bodies have been littered all over the city - all we want is our money. We've been stigmatised in our communities, so let the government pay us our money."
Sky's Alex Crawford saw first-hand the extreme precautions burial teams in the region have to take as they retrieve corpses.
She said teams in neighbouring Liberia - the worst affected country with more than 2,000 deaths - were overwhelmed, with "not enough hours in the day for them to track down the dead".
Any temporary halt in collection only adds to the risk of further infection because the virus can stay on the bodies, said Sky's Health Correspondent Thomas Moore.
Six hundred people have died from the virus in Sierra Leone, according to the World Health Organisation, and more than 3,400 in total.
The virus has swept through Liberia, Guinea, Sierra Leone and Nigeria, with the World Bank saying the financial impact could hit $32.6bn (£20bn) by the end of the year
In Britain, David Cameron chaired an emergency meeting as four hospitals stand by to handle any UK cases.
The UN, meanwhile, has said one of its medical officials in Liberia has tested positive for ebola and is receiving treatment.
The unnamed official is the second member of their mission to contract the virus - the other died on 25 September.
Ebola is a virulent virus that has killed thousands during the latest outbreak and is notorious for its low survival rate among sufferers of the full-blown disease. Here we explain what it is.
What is ebola?
Ebola is a virus that can develop into a full-blown disease known as ebola haemorrhagic fever (ebola HF) or ebola viral disease (EVD), which in some patients leads to massive internal and external bleeding.
Contrary to popular belief, it is not flesh-eating, but destroys living tissue cells, which leads to the haemorrhaging, or bleeding.
Is it always fatal?
The average fatality rate is 50% but case fatality rates have varied from 25% to 90% of people who contract the full-blown disease. It is not known why others survive.
Around 70% of those who have contracted ebola during the latest outbreak have died.
How is it transferred?
Ebola is transferred from person to person through contact with the blood or secretions of other bodily fluids of infected people.
It can also be caught from infected animals or during burial ceremonies in which mourners come into contact with dead victims.
Sufferers who are recovering after surviving the infection are known to have passed on the virus through sexual intercourse.
What are the symptoms?
Ebola often starts with a rapidly developing fever, intense weakness, muscle pain, headaches and a sore throat.
This is followed by vomiting, diarrhoea, a rash, kidney and liver problems and bleeding.
In some patients death can be very painful, as the disease destroys connective tissue and also attacks skin and internal organs. The time from infection through to appearance of symptoms is between two and 21 days.
How can it be prevented or treated?
There is no vaccine for ebola. Besides intensive supportive care to replace lost fluids (eg oral rehydration solution), the only medicine for the illness is ZMapp.
The experimental drug has been credited with saving lives since it was tested on sufferers for the first time this year.
However, it has not yet been subject to randomised clinical trials to establish its safety and whether it works.
Where does it come from?
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Gallery: The Desperate Fight To Contain The Ebola Outbreak
A man rests outside the clinic.
A woman is comforted after medical officials remove her husband, who is suspected of having the disease.
Officials try to prevent themselves from spreading the disease.
A local who has just brought his brother to the centre. He had to rely on plastic bags tied around his hands to try to protect himself.
A man thought to be infected with ebola waits for treatment.
Patients wait to be seen by medical staff.
Workers try to decontaminate themselves.
A worker with a child who may have caught ebola.
A make-shift hand-washing station in Monrovia.
Decontaminated boots of medical staff.
The basic conditions make containing the disease very difficult.
The disease was first identified in Zaire in 1976, in a part of Africa that is now part of the Democratic Republic of Congo.
It is believed that fruit bats may be one of the hosts and is also known to be present in monkeys and apes.
It is thought it may have made the leap from animal to human through the custom of consuming bush meat, which is common in some parts of Africa.
How dangerous is it?
It is classified as a level 4 biohazard, regarded as the most dangerous and requiring decontamination for those who work with it.
A Madrid nurse who became the first person to contract ebola outside of Africa is being treated with antibodies from survivors of the illness, hospital officials have revealed.
Four people, also including her husband, have been placed in quarantine at the hospital over fears they may also have the deadly virus.
The nurse was part of a medical team at the city's La Paz-Carlos III hospital that treated two Spanish missionaries who died shortly after returning from Africa with the disease.
A second nurse who also helped treat an infected priest is among the four being monitored by health workers, as is a man who arrived on a flight from Nigeria displaying symptoms.
Spain's health authorities said they had been in touch with a total of 22 people who are thought to have been in contact with the 40-year-old nurse, whose name has not been released.
They are also monitoring around 30 other members of the health care team that treated one of the missionaries.
Officials added that although the nurse began a holiday after one of the missionaries she had been caring for died on 25 September, she did not leave Madrid during this time.
She began feeling ill on 30 September and was diagnosed with ebola on Monday, but is in a stable condition.
EU countries have demanded an explanation from Spain's health minister as to how the nurse caught the disease, despite all the precautions taken
A spokesman said a letter sent to the health minister sought "to obtain some clarification" from Spanish authorities, adding: "The priority remains to find out what actually happened."
Spain's health minister, Ana Mato, said an emergency protocol is in place and that authorities are working to establish the source of the contagion at the Madrid hospital.
"We are working to guarantee the safety of all citizens," she said.
In the US, President Barack Obama says airport screening measures are being stepped up in the country to help identify people who might have the deadly virus.
More than 3,400 people have died in the latest ebola outbreak, which has swept through West African countries Liberia, Guinea, Sierra Leone and Nigeria.
Meanwhile, the British Army said more than 100 British Army medics were being sent to Sierra Leone to help tackle the ebola crisis within the next few weeks.
Personnel from the 22 Field Hospital have been undergoing an extensive training exercise in full protective suits, with simulated casualties in make-up.
They will staff a field hospital set up specifically to treat medics who have caught the disease, not members of the general public.
1/11
Gallery: The Desperate Fight To Contain The Ebola Outbreak
A man rests outside the clinic.
A woman is comforted after medical officials remove her husband, who is suspected of having the disease.
Officials try to prevent themselves from spreading the disease.
A local who has just brought his brother to the centre. He had to rely on plastic bags tied around his hands to try to protect himself.
A man thought to be infected with ebola waits for treatment.
Patients wait to be seen by medical staff.
Workers try to decontaminate themselves.
A worker with a child who may have caught ebola.
A make-shift hand-washing station in Monrovia.
Decontaminated boots of medical staff.
The basic conditions make containing the disease very difficult.
An Army spokeswoman said: "They are going through all their procedures and getting atuned to wearing their personal protective equipment, working in quite hot temperatures."
Experts say quarantine systems in developed countries including the UK, US and Spain mean the disease is very unlikely to spread to the same extent seen in poor African countries.
Turkish President Recep Erdogan says Syrian border town Kobani is "about to fall" to Islamic State militants and that a ground operation is needed to defeat the group.
It comes as fresh airstrikes targeted fighters who have been bombarding the town with machine-gun fire and shells.
Plumes of smoke billowed into the air over Kobani after jets launched the attack, believed to have been part of the US-led mission.
IS fighters raised their black flag over two buildings in the key border town after a day of heavy fighting on Monday.
The militants were reported to have moved into the southwest of Kobani overnight, taking several buildings to gain attacking positions on two sides of the town.
Fierce fighting raged in the area over the weekend as local Kurdish fighters struggled to hold out against rocket and mortar attacks - despite support from another three US strikes.
But Jenan Moussa, a reporter just 500m over the border in Turkey, told Sky News that the fighting was much quieter compared with Monday when bullets were "flying over our heads".
"I can still hear shooting and shelling but nothing compared to yesterday," she said.
"I heard and I saw three airstrikes. One on the western side and two on the eastern."
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Gallery: IS Attacks Town Near Turkish Border
Turkish army tanks take up position on the Turkish-Syrian border near the southeastern town of Suruc in Sanliurfa Province
Kurdish fighters vowed not to abandon their increasingly desperate efforts to defend the Syrian border town of Kobani from Islamic State militants pressing in from three sides and pounding them with heavy artillery
Despite the heavy fighting, which has seen mortars rain down on residential areas in Kobani and stray fire hit Turkish territory, a Reuters reporter saw around 30 people cross over from Turkey, apparently to help with defence of the town
An IS fighter walks near a black flag belonging to the Islamic State near Kobani
Kurdish refugees from Kobani sit in front of their tents in a camp in the southeastern town of Suruc
Islamic State is trying to seize Kobani, which is predominantly Kurdish, and has ramped up its offensive in recent days despite being targeted by US-led coalition airstrikes aimed at halting its progress
Turkish Kurds look at Kobani as they stand on top of a house near Mursitpinar border crossing. Continue through for more pictures
Turkey has put a line of tanks close to the border in a show of force should IS cross the line into its territory.
At least 400 people - fighters from both sides, and civilians - have been killed during three weeks of fighting around the town, according to British-based Syrian Observatory for Human Rights.
It said it had documented the deaths from sources on the ground but added the real figure could be double.
Sky News Foreign Affairs Editor Sam Kiley said the Kurds were angry that they had not been getting enough air support.
"If (Kobani) falls then symbolically and strategically it will send a message to the Kurds that the coalition is not going to come to their aid."
IS began its advance on Kobani on 16 September, prompting weeks of street battles and forcing around 160,000 people to flee into Turkey.
The group - who last week murdered British hostage Alan Henning - controls large areas of Syria and Iraq and wants more territory for its 'caliphate'.
Violent clashes were reported overnight in Istanbul and other Turkish cities as hundreds of demonstrators angered at the IS advance clashed with police.
Protesters set up barricades, threw stones, fireworks and petrol bombs at police in some Istanbul neighbourhoods, said the country's Dogan news agency.
Police also reportedly used tear gas and water cannon on protesters in the Kurdish-dominated cities of Diyarbakir, Batman, Van, Sirnak, Sanliurfa and Hakkari.
Tensions in Turkey - a member of the NATO alliance - are rising after its parliament last week authorised military action if necessary.
The order allows incursions into Syria and Iraq to counter the threat "from all terrorist groups" and also means NATO powers could use the country as a base for airstrikes.
By Frazer Maude, Sky Reporter, Manchester Crown Court
A former DJ brought a young girl to Jimmy Savile to be raped - then raped her himself straight afterwards, a court has been told.
Ray Teret is accused of over 30 historical sexual offences against victims as young as 12, dating from 1962 to 1996.
As his trial got under way, jurors were told that Savile's name will crop up and that one of the charges involves the late broadcaster.
Tim Evans, prosecuting, told Manchester Minshull Street Crown Court that Teret - who worked at pirate station Radio Caroline and Piccadilly Radio - had a "deal of celebrity" in the 1960s and '70s, especially in the Manchester area.
Teret is on trial along with two other men - William Harper and Alan Ledger.
Mr Evans said: "The Crown's case in a nutshell is that he used the celebrity that he had to abuse young girls in various ways and that the other two defendants - Mr Ledger and Mr Harper - friends and associates of Teret - also became involved on occasions."
He said Teret's victims were abused after having "the spotlight of fame" shone upon them.
The 72-year-old from Altrincham knew Savile from when the pair were working together in Manchester.
One of Teret's alleged victims told police she was 15 when he took her to a flat in the city in the early 1960s.
She told officers she "couldn't believe it" when she saw Jimmy Savile there and "couldn't wait to tell her friends she had met him."
The court heard that she was given a glass of Lucozade and sat next to Savile, but that seconds later he was raping her.
When Savile finished, she claims Teret pushed her back down on the bed and raped her himself.
Jurors heard that Teret told the girl she should "thank us" for what they had done, before giving her some money to catch a bus home.
The alleged victim told police she threw the money away when she left the flat, vomited and went home.
"All the way home I felt it was my fault," she said in her statement.
"I've kept it in for 51 years and always felt it was my fault."
Urging jurors not to allow the involvement of Savile to influence them, Mr Evans told them: "Nobody can have failed to come across all the publicity about Savile's conduct, whether at the BBC, prisons, hospitals or elsewhere with young girls and boys and other vulnerable victims. "
"This is the trial of these three men. In no sense are these men to be treated as guilty or contaminated because of the spectre of Savile."
Alan Ledger, 62, faces charges of indecent assault, indecency with a child and serious sexual assault. William Harper, 65 and himself a former DJ, is charged with the attempted rape of a girl under the age of 16.
The three men deny all the charges against them. The trial is due to last eight weeks.
A British millionaire accused of murdering his wife on their honeymoon in South Africa has told a judge he is bisexual.
Shrien Dewani, 34, denies orchestrating his wife's death by hiring three men to kill the 28-year-old as they drove through Cape Town's Gugulethu Township on 13 November, 2010.
Appearing at Western Cape High Court in Cape Town, the care home owner denied charges of murder, conspiracy to commit kidnapping, robbery with aggravating circumstances, kidnapping and defeating the ends of justice.
He told judge Jeanette Traverso: "I plead not guilty to all five counts, my lady."
Through a witness statement read to the court by his solicitor Francois van Zyl, he also told the court he was bisexual.
In it, he said: "My sexual interactions with males were mostly physical experiences or email chats with people I met online or in clubs, including prostitutes."
Footage of the crime scene, including Anni's body inside the taxi, were also shown to the court.
The court heard Dewani had abnormally low levels of hormones and that he and his wife were unlikely to have children. He said he had discussed this with Anni, whom he began dating in summer 2009.
Their relationship broke down, but they got back together in March 2010 and married later that year in Mumbai.
Dewani said the carjacking in Cape Town was a "traumatic experience which resulted in the loss of my wife".
He added he has suffered "flashbacks, nightmares and anxiety attacks" since, which has affected his ability to remember clearly.
Mr van Zyl said his client remembered banging noises coming from the front of the car during the carjacking.
Dewani added: "The next thing I recall is somebody next to me, who told me to lie down. The person had a gun in his hand. He was waving the gun in the air."
Anni Dewani's family, including her father Vinod Hindocha and mother Nilam, were among those in a packed courtroom on Monday.
Prosecutors claim Dewani conspired with Zola Tongo, Mziwamadoda Qwabe and Xolile Mngeni to kill his wife. All three are already serving jail terms in connection with Anni's murder.
He claims he and his wife were kidnapped at gunpoint as they drove through the township.
The court heard Anni Dewani was screaming inside the taxi and he was ordered to keep her quiet as they were driven by another driver. Dewani said he was ordered to get out of the car with a gun to his head and he had to climb out of a window because the door would not open.
He added: "The last thing I had said to Anni was to be quiet and not to say anything."
Dewani was released unharmed, but his wife's body was found in the abandoned taxi the following day with gunshot wounds to the hand and neck.
Before the trial, he was detained in a hospital in Britain with depression and post-traumatic stress disorder and has spent the last three years fighting extradition to South Africa.
It is unclear if Dewani will give evidence in his defence. The case is due to run until December.
The trial continues.
Islamic State militants have apparently captured part of a town close to the Syrian border with Turkey after days of fierce fighting.
The extremist group raised its black flag on a building on the eastern side of Kobani, where Kurdish fighters have been involved in clashes after a nearly three-week siege of the town, according to Reuters.
Idris Nahsen, a Kobani official, had said the militants were less than a mile from the town, which was hit by rockets and mortars during fighting over the weekend.
The US also carried out three airstrikes targeting IS positions near the town in Syria on Sunday.
The British-based Syrian Observatory for Human Rights claimed at least 33 IS militants and 23 Kurdish defenders were killed during the fighting.
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Gallery: IS Attacks Town Near Turkish Border
Turkish army tanks take up position on the Turkish-Syrian border near the southeastern town of Suruc in Sanliurfa Province
Kurdish fighters vowed not to abandon their increasingly desperate efforts to defend the Syrian border town of Kobani from Islamic State militants pressing in from three sides and pounding them with heavy artillery
Despite the heavy fighting, which has seen mortars rain down on residential areas in Kobani and stray fire hit Turkish territory, a Reuters reporter saw around 30 people cross over from Turkey, apparently to help with defence of the town
Kurdish refugees from Kobani sit in front of their tents in a camp in the southeastern town of Suruc
Islamic State is trying to seize Kobani, which is predominantly Kurdish, and has ramped up its offensive in recent days despite being targeted by US-led coalition airstrikes aimed at halting its progress
Turkish Kurds look at Kobani as they stand on top of a house near Mursitpinar border crossing. Continue through for more pictures
One shell was fired from inside Syria and hit a house in the Turkish village of Buyuk Kendirci, injuring four people.
IS began its advance on Kobani on 16 September, forcing around 186,000 people to flee across the border into Turkey.
It has seized swathes of Syria and Iraq after declaring an Islamic caliphate in June, including a long stretch of the Syria-Turkey border.
The Turkish parliament authorised involvement in the campaign against IS last week, but no military operations have been announced.
It comes after a masked IS militant was filmed murdering British aid worker Alan Henning and threatening US hostage Peter Kassig in a video released on Friday.
The 47-year-old former taxi driver, from Eccles in Greater Manchester, was captured as he drove an ambulance full of aid supplies into Syria on 27 December last year.
The Ministry of Defence said two Tornado fighters had dropped Paveway bombs on IS targets near Ramadi, in Iraq, on Sunday night.
The RAF jets, based in Akrotiri, Cyprus, attacked IS forces who were shooting at Iraqi troops from a building near the city.
A leader from the al Qaeda-linked Islamic Movement of Uzbekistan (IMU), a Taliban ally that has been based in Pakistan's tribal belt since 2001, has declared its support for IS.
The group was set up in the 1990s and is listed as a terrorist group by the US.
