The Hamas-run Civil Defence agency said Israeli strikes killed at least 37 people across Gaza on Thursday. As well as Gaza City, local media reported deaths in Jabalia and Beit Lahia in the north, and in Khan Younis in the south.
Also on Thursday, a controversial US and Israeli-backed aid group working in Gaza said it had reopened two of its distribution centres, a day after closing them for "renovation".
"Over the past 24 hours, we have been fully focused on strengthening our distribution sites to ensure safe and more efficient delivery of life-saving aid to the people of Gaza," the Gaza Humanitarian Foundation's (GHF) interim executive director John Acree said in a statement.
On Wednesday, the GHF announced that it was shutting all of its sites - three out of four of which had been operational - to make them "as safe as possible" following a string of deadly incidents nearby.
Dozens of Palestinians have been killed in recent days while approaching one of the centres in Rafah on a route that runs through an Israeli military zone.
Witnesses have said Israeli forces opened fire at crowds seeking aid.
The Israeli military has denied that it fired at civilians within the centre, but it has said that troops fired at "suspects" who ignored warning shots and approached them.
The GHF has denied that anyone was killed or injured at its centres.
The group, which uses US private security contractors, aims to bypass the UN as the main supplier of aid to Palestinians.
The UN and other aid groups refuse to co-operate with the new system, saying it contravenes the humanitarian principles of neutrality, impartiality, and independence.
They also warn that Gaza's 2.1 million population faces catastrophic levels of hunger after an almost three-month total Israeli blockade that was partially eased two weeks ago.
The US and Israel say the GHF's system will prevent aid being stolen by Hamas, which the group denies doing.
Separately, the Israeli military said it recovered the bodies of two Israeli-Americans taken back to Gaza as hostages during the Hamas-led attack on southern Israel on 7 October 2023.
Israel launched a military campaign in Gaza in response to the attack, in which about 1,200 people were killed and 251 others were taken hostage.
At least 54,677 people have been killed in Gaza since then, according to the territory's Hamas-run health ministry.