Israeli strikes on multiple homes in the northern Gaza Strip overnight and into Sunday left at least 87 people dead or missing, the territory’s Health Ministry said. It said another 40 people were wounded in the strikes on the town of Beit Lahiya, which was among the first targets of Israel’s ground invasion nearly a year ago.

The strikes came as the US is investigating an unauthorized release of classified documents that assess Israel’s plans to attack Iran, according to three US officials. A fourth US official said the documents appear to be legitimate.