Israel's military said the ceasefire was back on in Gaza after it carried out heavy airstrikes overnight that killed 104 people, including 46 children, according to local health officials.

The Red Cross said it transferred the unidentified remains of three people to Israel late Friday, but they were still being examined and may not be those of missing hostages, an Israeli military official said.

In a somber gesture shrouded by smoke and sorrow, the Palestinian group Hamas has handed over two bodies it said belonged to deceased Israeli captives — even as Israel’s renewed assault tore through G...