Al Qaida has begun methodically "grooming" children and young people to carry out terror attacks in Britain, the head of MI5 warned today.
In his first public speech since becoming director general in April, Jonathan Evans said the Security Service now knew of at least 2,000 individuals who posed a "direct threat to national security and public safety" because of their support for terrorism.
However, he said that MI5's efforts to counter the terrorist threat were being hampered by the continuing need to divert resources to tackle "unreconstructed" spying by old Cold War adversaries such as Russia and China.
Addressing the Society of Editors Conference in Manchester, Mr Evans said that the number of individuals identified as having links with terrorism had risen by 400 since the last assessment by his predecessor, Dame Eliza Manningham-Buller, a year ago.
And MI5 suspected that there could be another 2,000 whom they knew nothing about, he said.
Mr Evans warned that the terrorist problem had not yet reached its peak and he endorsed Prime Minister Gordon Brown's assessment that Britain was facing a "generation-long challenge" to defeat it.
"Terrorist attacks we have seen against the UK are not simply random plots by disparate and fragmented groups," he said.
"The majority of these attacks, successful or otherwise, have taken place because al Qaida has a clear determination to mount terrorist attacks against the United Kingdom. "This remains the case today, and there is no sign of it reducing."
Mr Evans highlighted the way that al Qaida was targeting vulnerable young people as terrorist recruits, with teenagers as young as 15 and 16 years old having been implicated in terrorist plots.
"As I speak, terrorists are methodically and intentionally targeting young people and children in this country," he said.
Agencies