A nun reacts as Egyptian security forces (unseen) inspect the scene of a bomb explosion at the Saint Peter and Saint Paul Coptic Orthodox Church on December 11, 2016, in Cairo's Abbasiya neighbourhood. - The blast killed at least 25 worshippers during Sunday mass inside the Cairo church near the seat of the Coptic pope who heads Egypt's Christian minority, state media said. The attack was claimed by the Islamic State (IS) group. (Photo by KHALED DESOUKI / AFP)        (Photo credit should read KHALED DESOUKI/AFP/Getty Images)