By Jon Craig, Chief Political Correspondent

David Cameron is to attempt to launch a crackdown on the preachers of hate blamed by the Government for the extremism that led to the murder of Drummer Lee Rigby in Woolwich.

The Prime Minister’s fightback will come with the launch of a taskforce to tackle all forms of radicalisation that can lead to violent extremism and terrorism.

The group will include the most senior members of the Cabinet, including Nick Clegg, George Osborne, Theresa May, Eric Pickles and Chris Grayling, as well the Muslim Foreign Office minister Baroness Warsi.

 In tackling extremism, the task force will aim to produce initiatives on:

:: Disrupting extremist activity

:: Challenging poisonous narratives

:: Trends in radicalisation

:: Tackling radicalisation in institutions (mosques, madrassas, schools, colleges, universities and prisons)

:: Supporting faith and community leadership to build strong, integrated and united communities

Writing in The Sunday Telegraph, Mr Pickles, the Communities Secretary said: "Our answer to the extremists and preachers of hate is to speak out, to show them for what they are.