He said they were looking for information that related to his work in the intelligence community in Northern Ireland, including information on an Irish Republican Army informer.

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Mr. Pistole, an FBI veteran who took over TSA in 2010, said that by studying frequent-flier histories as well as conducting background checks, he's confident the U.S. now has the technology and the intelligence information to make less-rigorous, faster screening work.

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To prevent future attacks, we agreed that our law enforcement and intelligence agencies will work even closer, including sharing more information.

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But we do know now that coordinating intelligence information and the responses of government agencies is absolutely critical as we work to maximize the safety of all Americans.

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The FBI said Sentinel is being deployed for use by analysts and employees from intelligence and other agencies who work on terrorism cases with the FBI, to aid information sharing.

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Sir Norman Bettison from the Association of Chief Police Officers, who, when asked if community projects are being used as "Trojan horses" to gather information, told the programme there was "no dedicated intelligence gathering" as part of the Prevent community work.

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