1. Egypt suffered one of the worst civilian massacres in its modern history.

Islamist militants detonated bombs and unleashed torrents of bullets at a mosque on the Sinai Peninsula, killing at least 235 people and wounding more than 100 others. Even ambulances were targeted. “We don’t know what to say. This is insane,” a medical official said.

There were no immediate claims of responsibility, but the worshipers were Sufis, whose mystical form of Islam is considered heretical by Sunni extremists, and the Egyptian military has been battling an affiliate of the Islamic State in the Sinai for years.