Several Palestinians were killed or wounded on Sunday in an Israeli airstrike that hit a school in central Gaza, health officials said.
The media office has so far put the death toll at 15 people killed, adding that the school was housing displaced people.
On Saturday, the health ministry in Gaza said the death toll from an Israeli strike on Al-Mawasi, where displaced Palestinians were sheltering, had risen to at least 90.
The ministry said "half" of the dead were women and children and that there were 300 wounded, many in a "critical" condition. Israel said it had targeted a senior Hamas official in the area in the Gaza Strip's south.
The attack was the deadliest in Gaza for weeks.
Israel said the attack targeted Hamas military chief Mohammed Deif but it was uncertain whether he had been killed. Hamas has said that Deif is 'fine' and that Israeli claims it had targeted leaders of the group were false and were aimed at justifying the attack.
Meanwhile, at least 17 Palestinians were killed and 50 were wounded in Israeli strikes on Gaza City in the early hours of Sunday morning, civil emergency and health officials said.
The fatalities resulted from at least four separate Israeli airstrikes on four houses in different areas of the city. Residents and Palestinian health officials said the Israeli military had stepped up aerial and ground shelling.