FILE - In this Jan. 6, 2018 file photo, a priest leads prayers prior to Christmas Eve Mass at the Virgin Mary church, in Cairo, Egypt. The killing of a respected bishop in a desert monastery north of Cairo has opened a rare window onto the cloistered world of Egypt’s Coptic Orthodox Church. It’s one of the oldest Christian communities in the world and the one that introduced monasticism to the faith. But the killing of the abbot, and the arrest of two monks suspected in his death, has shaken the church. (AP Photo/Amr Nabil, File)
A priest leads prayers prior to Christmas Eve Mass at the Virgin Mary church, in Cairo, Egypt. AP

Egypt's ancient Coptic community rattled by bishop murder saga