ISTANBUL, TURKEY - DECEMBER 18: Men take part in Friday prayer ceremonies at Eminonu Mosque on December 18, 2015 in Istanbul, Turkey. (Photo by Chris McGrath/Getty Images)
ISTANBUL, TURKEY - DECEMBER 18: Men take part in Friday prayer ceremonies at Eminonu Mosque on December 18, 2015 in Istanbul, Turkey. (Photo by Chris McGrath/Getty Images)