Britain's Prime Minister, Tony Blair, has said he agrees with the head of MI5, who believes the so-called terrorist threat will last for a generation.
He was speaking after the MI5 chief, Dame Eliza Manningham-Buller, said her organisation was examining 30 terrorist plots.
Mr Blair said a belief in democratic values could overcome the threat.
'I have been saying for several years this terror threat is very real,' Mr Blair said.
'We need to combat the poisonous propaganda of those people that warps and perverts the minds of younger people.'
Mr Blair said that 'it's a very long and deep struggle but we have to stand up and be counted for what we believe in and take the fight to those people who want to entice young people into something wicked and violent but utterly futile'.