Hundreds of videos inciting violence, including some linked to the suspected al Qaida mastermind of the cargo plane terror plot, have been removed from YouTube.
The clips by Anwar al-Awlaki, a high-profile member of the terror group thought to be behind the cargo bomb plot, were deleted from the video sharing site and more were being examined.
The videos were highlighted after a student tried to murder a Labour MP after being inspired by clips from the radical cleric.
Roshonara Choudhry, 21, stabbed Stephen Timms twice in the stomach after watching the US-born extremist's online jihadi sermons and was jailed for life with a minimum term of 15 years.
The removal of the videos follows a private speech in the United States by security minister Baroness Neville-Jones, reported in The Daily Telegraph, in which she called on the White House to "take down this hateful material" in cases where servers were based in the US.
"When you have incitement to murder, when you have people actively calling for the killing of their fellow citizens and when you have the means to stop that person doing so, then I believe we should act," she said.
"Those websites would categorically not be allowed in the UK. They incite cold-blooded murder and as such are surely contrary to the public good."
In one sermon, 44 Ways to Support Jihad, al-Awlaki told followers: "Jihad today is obligatory on every capable Muslim."
A YouTube spokesman said: "YouTube has community guidelines that prohibit dangerous or illegal activities such as bomb-making, hate speech, or incitement to commit specific and serious acts of violence.
"We also remove all videos and terminate any account registered by a member of a designated Foreign Terrorist Organisation (FTO) and used in an official capacity to further the interests of the FTO."
