The man in his 50s was arrested in a neighborhood in southeast London on suspicion of conspiracy to commit murder.
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Mounted police gather as members of the English Defence League march through Whitehall towards Downing Street on May 27, 2013 in London, England. The EDL are protesting what the group sees as a lack of support and protection given to British troops following the terror attack last week, in which soldier Drummer Lee Rigby was murdered in a knife and machete attack by two Muslim men outside Woolwich Barracks. (Peter Macdiarmid/AFP/Getty Images)
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