Egypt—Friday 26th, 2017. A handful of masked men lay in wait where the busy highway and the sandy back road leading to the Monastery of St. Samuel the Confessor intersect. Located in the Minya Governorate, 120 miles south of Cairo, the Monastery is one of Coptic Christianity’s holiest shrines. One-tenth of Egypt’s 92 million population is Christian.

Consequently, sites of worship such as this are always busy—even though tourism, a staple for the Egyptian economy, has suffered since the Arab Spring in 2011 and the fact that Minya is 120 miles south of Cairo.

The black-clad men stopped a convoy of two buses and a pickup truck. With guns in hand, they demanded that the pilgrims denounced their Christian faith. The travelers refused. Thirty were killed, including one American from Chicago, with shots in the head and another 23 injured.

ISIS has claimed responsibility for the attack. As retaliation, the Egyptian Air Force bombed targets in the Libyan city of Derna, where the terrorists are believed to have come from.