At least 33 people have been killed and 85 wounded in Israeli strikes that hit several houses in Jabalia, the largest of Gaza’s eight historic refugee camps, medics say, where residents said tanks blew up roads and houses.

According to Reuters, the Gaza government media office said the death toll from the strikes could rise because some people were believed to be trapped under the rubble, and the Palestinian official news agency Wafa said children were among those killed. There was no immediate Israeli comment.

Other Israeli strikes killed at least 39 Palestinians across Gaza on Friday, 20 of them in Jabalia, the Gaza health ministry said.

Residents of Jabalia said Israeli tanks had reached the heart of the camp after pushing through suburbs and residential districts. They said the Israeli army was destroying dozens of houses daily, from the air and the ground, and by placing bombs in buildings and then detonating them remotely.

The Israeli military insists its operation in Jabalia is intended to stop Hamas fighters regrouping for more attacks.

Residents said Israeli forces had effectively isolated the far northern Gazan towns of Beit Hanoun, Jabalia, and Beit Lahiya from Gaza City, blocking movement except for those families heeding evacuation orders and leaving the three towns. They said communications and internet services had been cut, disrupting rescue operations.