JERUSALEM — Israeli strikes killed dozens of Palestinians in the northern Gaza Strip overnight, Palestinian health officials said Wednesday, as Israel threatens to ramp up its military campaign in the enclave despite mounting international pressure.

The bodies of more than 50 people killed overnight had arrived at the Indonesian Hospital by noon Wednesday, according to Marwan Sultan, director of the medical facility in the town of Beit Lahia. He said that children were among the dead and that dozens more people had been injured.

Gaza’s Health Ministry also said about 70 people had been killed Wednesday, without specifying where. Gaza health officials do not distinguish between combatants and civilians when reporting death tolls.

Israel has been threatening a massive escalation across Gaza in an attempt to force Hamas to surrender and release the remaining hostages it has held for more than 18 months. The plan, as described by Israeli leaders, would displace many Palestinians in Gaza who, in some cases, have been forced from their homes or temporary shelters several times since the start of the war.

On Wednesday, the Israeli military said in a statement that its forces had struck Hamas and Islamic Jihad militants in northern Gaza, adding that it had sought to mitigate harm to civilians. An Israeli military spokesperson warned Palestinians in parts of the enclave’s north to flee in the face of an impending attack after rockets were fired at Israeli territory.