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CAIRO, EGYPT - DECEMBER 14 : People hold candles during a commemoration for victims of a Sunday bombing at a Coptic cathedral in Cairo, Egypt on December 14, 2016. Twenty five people were killed at the Coptic cathedral in what was one of the attacks on the religious minority in recent memory. (Photo by Stringer/Anadolu Agency/Getty Images)

CAIRO, EGYPT - DECEMBER 14 : People hold candles during a 	commemoration for victims of a Sunday bombing at a Coptic cathedral in Cairo, Egypt on December 14, 2016. Twenty five people were killed at the Coptic cathedral in what was one of the attacks on the religious minority in recent memory. (Photo by Stringer/Anadolu Agency/Getty Images)