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Man detained after Westminster incident was known to UK spy agency - security source

A man is held by police in Westminster after an arrest was made on Whitehall in central London, Britain, April 27, 2017. REUTERS/Toby Melville

LONDON (Reuters) - The London man detained by armed police in Westminster was known to counter-terrorism officers and Britain's domestic intelligence agency MI5 before his arrest, a Western security source told Reuters. The 27-year-old man was detained by counter-terrorism officers on Parliament Street, a stone's throw from the UK parliament building and May's Downing Street office, during a stop and search as part of an ongoing operation, London police said. (Reporting by Michael Holden; editing by Guy Faulconbridge)