At least 80 people have been killed in Israeli strikes across Gaza, hospitals and first responders say.
The Indonesian hospital said 22 children and 15 women were among 50 people who died when several homes in the northern Jabalia area were hit overnight. Nearby al-Awda hospital said it had received the bodies of another nine people, seven of them children.
The Israeli military said it struck Hamas and Palestinian Islamic Jihad fighters in the north. It had warned residents of Jabalia and neighbouring areas to evacuate on Tuesday after rockets were launched into Israel.
It came as the UN's humanitarian chief urged members of the UN Security Council to take action to "prevent genocide" in Gaza.
Speaking at a meeting in New York on Tuesday, Tom Fletcher accused Israel of "deliberately and unashamedly imposing inhumane conditions on civilians".
He also called on Israel to lift its 10-week blockade on Gaza and criticised the Israeli-US plan to take over the distribution of humanitarian aid by using private companies, saying it was a "fig leaf for further violence and displacement" of Palestinians.
Israel's envoy to the UN, Danny Danon, said the accusations were "baseless and outrageous".
He insisted the existing system for aid was "broken" because it was being used to help Hamas's war effort – an allegation both the UN and the armed group have denied.
