DEIR AL-BALAH, Gaza Strip — An Israeli strike on a crowded tent camp housing Palestinians displaced by the war in Gaza killed at least 40 people and wounded 60 others early Tuesday, Palestinian officials said. Israel said it targeted “significant” Hamas militants, allegations denied by the militant group.

It was among the deadliest strikes yet in Mawasi, a sprawl of crowded tent camps along the Gaza coast that Israel designated as a humanitarian zone for hundreds of thousands of…