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British Prime Minister David Cameron (R) and London Mayor Boris Johnson leave St Paul's Cathedral in central London on July 7, 2015 after attending a memorial service in memory of the 52 victims of the 7/7 London attacks. Britain today marked 10 years since the London bombings with a minute's silence for the 52 victims, less than a fortnight after an attack in Tunisia highlighted the ongoing Islamist threat. 
 AFP PHOTO / JACK TAYLOR        (Photo credit should read JACK TAYLOR/AFP/Getty Images)
British Prime Minister David Cameron (R) and London Mayor Boris Johnson leave St Paul's Cathedral in central London on July 7, 2015 after attending a memorial service in memory of the 52 victims of the 7/7 London attacks. Britain today marked 10 years since the London bombings with a minute's silence for the 52 victims, less than a fortnight after an attack in Tunisia highlighted the ongoing Islamist threat. 
 AFP PHOTO / JACK TAYLOR        (Photo credit should read JACK TAYLOR/AFP/Getty Images)

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