The head of MI5, Jonathan Evans, in a rare public appearance, has said that hundreds of his officers are involved in an intense struggle to prevent successful terror attacks.
In his analysis of the speech, security correspondent Gordon Corera said Evans had argued that we have an "unrealistic expectation" that MI5 can be 100% successful in stopping future strikes.
"People should be prepared that even though we haven't had a successful attack since 7/7 that something can and will come," he reports Evans as arguing.
The MI5 chief also raised a serious concerns about the release of radical prisoners arrested in the direct aftermath of the 9/11 attacks.
James Brandon, head of research at the think tank and anti-extremist campaigning organisation the Quilliam Foundation said that, according to his research, the release of extremists would become a problem.
"The government didn't think that in prison these people would still be radicals, they would still be trying to recruit in prison, they will come out with their ideas unchanged, and they will go back to exactly what they were doing before," he said.
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