At least 28 Palestinians were killed in Israeli strikes at one family's home and at a school building overnight and early Sunday said Gaza's civil defence agency
However, the military said that those were used by Hamas.
There was no let-up in the violence in the Gaza Strip more than 14 months into the Israel-Hamas war, even as Palestinian groups involved in the fighting said a ceasefire deal was "closer than ever".
Civil agency spokesman Mahmud Bassal said in a statement that at least 13 people were killed in an air strike on a house in central Gaza's Deir el-Balah belonging to the Abu Samra family.
There was no immediate comment from the Israeli military, which has confirmed a separate strike further north, on a school in Gaza City.
Bassal said that eight people including four children were killed in the attack on the school, which had been repurposed as a shelter for Palestinians displaced by the war.
The Israeli military said it had carried out a "precise strike" overnight targeting Hamas militants operating there.
A military statement said that a Hamas "command and control centre... was embedded inside" the school compound in the city's east, adding that it was used "to plan and execute terrorist attacks" against Israeli forces.
Contacted by AFP, an Israeli military spokesperson said they were unable to immediately comment on other reported strikes elsewhere in Gaza.
Bassal said an overnight strike killed three people in Rafah, in the south.
And a drone strike early on Sunday hit a car in Gaza City, killing four people, Bassal said.
Hamas, whose October 7, 2023 attack on Israel triggered the war, and two other Palestinian armed groups said on Saturday in a rare joint statement that an agreement to end the bloodshed was "closer than ever".
The groups, which include Islamic Jihad and the Popular Front for the Liberation of Palestine, said that a truce in Gaza and hostage release deal was possible provided Israel does not impose new conditions in negotiations.
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