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TOPSHOT - Mourners light candles placed on rainbow flag draped with a black crape outside Barcelona's city hall during a vigil at Sant Jaume Square in Barcelona on June 13, 2016, called by LGTBicat community in remembrance of victims after a gunman opened fire in a gay nightclub in Orlando, Florida in the worst mass shooting in US history. US anti-terror strategy came under fresh scrutiny after a gunman previously cleared of jihadist ties launched a hate-fueled rampage in a Florida gay club that left 50 dead. / AFP / JOSEP LAGO (Photo credit should read JOSEP LAGO/AFP/Getty Images)

TOPSHOT - Mourners light candles placed on rainbow flag draped with a black crape outside Barcelona's city hall during a vigil at Sant Jaume Square in Barcelona on June 13, 2016, called by LGTBicat community in remembrance of victims after a gunman opened fire in a gay nightclub in Orlando, Florida in the worst mass shooting in US history. 
US anti-terror strategy came under fresh scrutiny after a gunman previously cleared of jihadist ties launched a hate-fueled rampage in a Florida gay club that left 50 dead.  / AFP / JOSEP LAGO        (Photo credit should read JOSEP LAGO/AFP/Getty Images)