Spotting terrorists who could attack Britain is like finding a needle in a haystack, Britain's most senior police officer has warned.Sir Mark Rowley said tens of thousands of people had come onto the security services' radar and may just need a spark to act.In an interview featured in an upcoming book by The Independent's home affairs editor Lizzie Dearden, he added: The ones who are going to go from passive supporters [of terrorism], doing nothing illegal, through to acting on it is a small number.
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