An airstrike by the Israel Defense Forces on a school-turned-shelter killed more than 93 people and injured dozens more on Saturday morning, according to Gaza’s civil defense, in one of the deadliest attacks in the 10-month war as mediators discussed ongoing efforts to de-escalate soaring tensions in the region.

The strikes hit the Tabeen school in Gaza City, including the mosque inside it, as congregants were performing dawn prayers.

The IDF said it was targeting a Hamas command center…