Acting Deputy Commissioner Mark Rowley (1st L) and other police officers pay a minute's silence tribute at Scotland Yard, headquarters of London's Metropolitan Police in London, Britain, on March 23, 2017. (Xinhua/Han Yan
Acting Deputy Commissioner Mark Rowley (1st L) and other police officers pay a minute's silence tribute at Scotland Yard, headquarters of London's Metropolitan Police in London, Britain, on March 23, 2017. (Xinhua/Han Yan
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