"Around 40 per cent of CIA activity on homeland threats is now in the UK. This is quite unprecedented." - British official
CIA warns Barack Obama that British terrorists are the biggest threat to the US 07 Feb 2009
American spy chiefs have told the President that the CIA has launched a vast spying operation in the UK to prevent a repeat of the 9/11 attacks being launched from Britain.
Intelligence briefings for Mr Obama have detailed a dramatic escalation in American espionage in Britain, where the CIA has recruited record numbers of informants in the Pakistani community to monitor the 2,000 terrorist suspects identified by MI5, the British security service.
A British intelligence source revealed that a staggering four out of 10 CIA operations designed to thwart direct attacks on the US are now conducted against targets in Britain.
The CIA has already spent 18 months developing a network of agents in Britain to combat al-Qaeda, unprecedented in size within the borders of such a close ally, according to intelligence sources in both London and Washington.
Bruce Riedel, a former CIA officer who has advised Mr Obama, told The Sunday Telegraph: "The British Pakistani community is recognised as probably al-Qaeda's best mechanism for launching an attack against North America . . .
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http://www.telegraph.co.uk/news/worldnews/northamerica/usa/barackobama/4550144/CIA-warns-Barack-Obama-that-British-terrorists-are-the-biggest-threat-to-the-US.html