British intelligence worry that British terrorists may be plotting to hit the U.S.

From yesterday's London Times:

British intelligence chiefs have confirmed to The Times that they are worried by the prospect of the next attack in America being committed by a British citizen arriving without hindrance in the US on the visa waiver programme. They are liaising closely with the FBI to identify possible suspects.

This statement was made in response to the U.S. State Department's release of its annual report on terrorism around the world. As the London Times reported on these findings:

The report also quoted Dame Eliza Manningham-Buller, the head of MI5, who made the “stark assessment” that there were 200 known terror networks in Britain, 1,699 individuals and 30 terror plots. It said: “The British Government viewed radicalisation of young people in the UK and elsewhere ... as a growing threat to international and British security.”

The report said that there is evidence that al-Qaeda is shifting to “guerrilla terrorism”, through which it seeks to “manipulate and exploit grievances in at-risk populations”. It added: “A deeper trend is the shift in the nature of terrorism, from traditional international terrorism of the late 20th century into a form of transnational non-state warfare that resembles of form of global insurgency.”