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London police take down over 1,000 extremist web pages every week, London's police chief has said.
Commissioner of Metropolitan Police Sir Bernard Hogan-Howe said the force had requested 300,000 pages be removed in the past 18 months.
Speaking to the London Assembly’s Police and Crime Committee, Sir Hogan-Howe said the majority of websites were terrorist related but that a small minority involved far-right extremism.
He said: "We are taking down about 1,000 sites a week which are extremist in nature. Now most of that is to with terrorist type posting but its not only that. Its also extremes on both sides. There are also right wing sites.
UK terror plots that were foiled by security servicesShow all 14 1 /14UK terror plots that were foiled by security services UK terror plots that were foiled by security services Oxford Street terror plot Lewis Ludlow was jailed for life in March 2019 for planning a 'spectacular multi-victim attack' on Oxford Street in London. He pleaded guilty at the Old Bailey last year to plotting an attack in the UK and funding Isis abroad
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UK terror plots that were foiled by security services Rosie Cooper MP plot Jack Renshaw admitted plotting to kill his local Labour MP with a machete in June 2018. Renshaw bought a 19in machete intending to use it to kill Rosie Cooper, MP for West Lancashire. His plan was foiled by whistleblower Robbie Mullen, who heard of the plot in a meeting of alleged and convicted National Action members in the Friar Penketh pub in Warrington
Hope Not Hate
UK terror plots that were foiled by security services 'Poppy terror plot' Nadir Ali Sayed, his cousin Yousaf Shah Syed, and Haseeb Hamayoon, were charged with terrorism offences over an alleged plot to behead a member of public. The trio were arrested in London and High Wycombe, Buckinghamshire on 6 November - three days before Remembrance Sunday in 2014
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UK terror plots that were foiled by security services National Action arrests Following the arrest of six men in 2018 on suspicion that they were members of the banned far-right terror group National Action, two were jailed. Christopher Lythgoe was found to be leader of the banned group and jailed for eight years, while Matthew Hankinson was jailed for six years. While it was found that Lythgoe did not encourage Jack Renshaw's plot to kill a Labour MP, the judge noted that he "did nothing to stop or discourage" the attack
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UK terror plots that were foiled by security services Shane Fletcher A self-described 'loner', Fletcher planned to kill members of the public at a football match in his home town of Workington. He had been referred to the government's Prevent programme nine moths prior to his arrest after stating that he dreamed about "shooting up a mosque"
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UK terror plots that were foiled by security services Heathrow airport arrests A 19-year-old from Coventry man was arrested at London's Heathrow airport on suspicion of preparing for acts of terrorism in November 2014
UK terror plots that were foiled by security services Extradition of Abu Hamza Radical muslim cleric Abu Hamza was extradited to the US in 2014 after having been jailed in the UK for 7 years for 11 offences under the Terrorism Act
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UK terror plots that were foiled by security services South East Counter Terrorism Unit arrests Six people were arrested on suspicion of terrorism offences after a series of dawn raids in the south of England in October 2014. Three men and three women were detained separately in two properties in Portsmouth, one in Farnborough and one in Greenwich following an operation by the South East Counter Terrorism Unit. Counter-terror officers said they had disrupted what was believed to be the early stages of what could have turned into a “significant plot”
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UK terror plots that were foiled by security services October 2014 arrests Three men were arrested in central London on 13 October as part of an investigation into Islamist-related terrorism. The arrests come nearly a week after five men were arrested in dawn raids that Whitehall officials said “may have foiled the early stages” of a plan to attack the UK
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UK terror plots that were foiled by security services Anjem Choudary arrest Anjem Choudary, the radical activist and co-founder of the banned al-Muhajiroun group, was arrested in September 2014 as efforts intensify to disrupt the ideological backers of young British Muslims travelling to fight in foreign conflicts. Mr Choudary was among nine men held on suspicion of supporting a banned terrorist group and encouraging terrorism. The arrests came shortly after Mr Choudary fired off a series of angry tweets after David Cameron called on MPs to back air strikes against Islamic State militants in Syria
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UK terror plots that were foiled by security services North West Counter Terrorism Unit funds seizing Police seize £250,000 of cash intended to fund Isis at Manchester Airport and north-west ports. Using powers under the Terrorism Act, the money was confiscated by officers from the North West Counter Terrorism Unit in Ocotber 2014
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UK terror plots that were foiled by security services Tarik Hassane arrest A medical student who was offered a place at a London university has been named among four men who are being questioned by counter-terror police after a series of raids across the capital. Tarik Hassane, 21, is believed to have been Tasered when he was arrested on suspicion of being involved in a "significant" Islamist terror plot on 7 October 2015
UK terror plots that were foiled by security services Abu Qatada removed from UK Radical preacher Abu Qatada will not be returning to the UK after being cleared of terror charges in Jordan in 2013
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UK terror plots that were foiled by security services Haider Ahmed knife plot Teenage Isis supporter Haider Ahmed purchased a 15ins hunting knife and threatened to launch a stabbing attack on the Tube. Prosecutors said he may alternatively have been planning to rob someone with the weapon to fund his travel to fight for Isis in Syria He was jailed for preparing an act of terrorism in June 2019
Counter Terrorism Policing South East
"And where we are legally able to do so, we are asking companies to take them down and they do so."
He said it "made an impact" but "doesn’t stop it unfortunately because the internet is so pervasive".
It comes as the London Assembly’s report on the Prevent counter-terrorism programme, which was published on Thursday , suggested technology companies needed to do more to engage with counter-terrorism police and local communities to crack down on extremism on social media.
Terror drill on streets of LondonShow all 7 1 /7Terror drill on streets of London Terror drill on streets of London Terror drill in London Armed officers storm the building in the City of London
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Terror drill on streets of London Terror drill in London Police officers pose as terrorists during the training exercise
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Terror drill on streets of London Terror drill in London Dummies representing casualties lie on the floor following the drill
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Terror drill on streets of London Terror drill in London Police dressed as militants simulate an attack on a shopping centre
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Terror drill on streets of London Terror drill in London 'Terrorist' and 'civilian' dummies were used in the drill
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Terror drill on streets of London Terror drill in London Police are being trained to 'go forward' during terror sieges
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Terror drill on streets of London Terror drill in London Police are being told to ignore casualties until suspects are immobilised
It said "the ability to monitor the terrorist threat has reduced because terrorists and criminals had changed their communication tactics and because of encryption technologies that exist on electronic devices".
The report suggested authorities create a map of where extremism online activity was taking place and develop local community resources to provide a "counter-narrative" to extremist ideology.
It comes after David Cameron announced the security services had foiled seven terror plots against the UK in the past six months, following a string of co-ordinated terrorist attacks on Paris in November .