The head of MI5 was quoted today as saying up to about 30 major terrorist plots were being planned in the country.
Eliza Manningham-Buller, director general of MI5, said young British Muslims were being groomed to become suicide bombers and that her agents were tracking some 1,600 suspects, most of whom were British-born and linked to al-Qaeda.
"We are aware of numerous plots to kill people and damage our economy. What do I mean by numerous? Five? Ten? No, nearer 30 . . . that we know of," Ms Manningham-Buller said in a speech in London yesterday.
Ms Manningham-Buller, who said her warnings were not intended to alarm but to paint a frank picture of the reality, was quoted as saying the plots were "priority one" cases.
Last year, Britain suffered its worst peace-time attack when four British Muslims blew themselves up on London's transport network, killing 52 commuters and wounding hundreds.
"My officers and the police are working to contend with some 200 groupings or networks, totalling over 1,600 identified individuals who are actively engaged in plotting or facilitating terrorist acts here and overseas," she said.
Ms Manningham-Buller said the number of cases being pursued by security services had risen by 80 per cent since January.
"Today we see the use of home-made improvised explosive devices. Tomorrow's threat may - and I suggest will - include the use of chemicals, bacteriological agents, radioactive materials and even nuclear technology," she said.