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CAIRO, EGYPT - DECEMBER 14: People hold candles during a silent candlelight vigil for the victims of Sunday's St Peter and St Paul Church explosion on a street in downtown Cairo on December 14, 2016 in Cairo, Egypt. The blast inside the church killed 25 people mainly women and children. (Photo by Chris McGrath/Getty Images)

CAIRO, EGYPT - DECEMBER 14:  People hold candles during a silent candlelight vigil for the victims of Sunday's St Peter and St Paul Church explosion on a street in downtown Cairo on December 14, 2016 in Cairo, Egypt. The blast inside the church killed 25 people mainly women and children.  (Photo by Chris McGrath/Getty Images)