On the evening of his first day in Cairo, Pope Francis placed his hand on the glass covering a blood-splattered wall in the Coptic Church of Ss Peter and Paul. On December 11 last year, a 22-year-old ISIS operative detonated a bomb containing 26lbs of TNT inside the church. The explosion killed 29 people, mainly women and children, and injured 47 others. The church still bears the scars of the attack: aside from the blood, there are pockmarked pillars and scorched icons. After touching the wall, the Pope bowed his head in prayer for the victims.