WARNING: This story contains graphic images

An Israeli airstrike on a Gaza school compound housing displaced families killed nearly 100 people, Gaza government officials said on Saturday, while the Israeli military said it targeted Hamas militants there and cast doubt on the death toll.

Video from the site showed body parts scattered on the ground and more bodies being carried away and covered in blankets on the floor. Empty food tins lay in a puddle of blood and burned mattresses and a child's doll were among the debris.

In another part of the Tabeen school complex in Gaza City, men prayed over a dozen body bags laid out on the ground.

Gaza officials said in a statement that the strikes hit when people sheltering at the school were performing dawn prayers, leading to many casualties.

"So far, there are more than 93 martyrs, including 11 children and six women. There are unidentified remains," said Palestinian Civil Defence spokesperson, Mahmoud Bassal, in a televised news conference.

Around 350 families had been sheltering at the compound, Bassal said. Two floors were hit, the upper floor housing families, including women and children, and the lower floor that was used as a mosque. The Gaza health ministry has so far not provided casualty details.

Israeli military disputes death toll

In a statement in Hebrew the Israeli military said the death toll was inflated. It said around 20 Hamas and Islamic Jihad militants were operating at the site.

"The compound, and the mosque that was struck within it, served as an active Hamas and Islamic Jihad military facility," Lieutenant Colonel Nadav Shoshani said on the social media platform X.

"According to an initial review, the numbers published by the Hamas-run Government Information Office in Gaza, do not align with the information held by the IDF (Israel Defence Forces), the precise munitions used, and the accuracy of the strike," Shoshani said.

A military official said that the part of the mosque struck was a men's area where no women or children were present.

"This was verified by intelligence and the strike was carried out using three small, precise munitions which cannot cause the scale of damage that the Palestinians are reporting," the official said.

Israel says Palestinian militant groups embed among Gaza's civilians, operating from within schools, hospitals and designated humanitarian zones — which Hamas and its allies deny.

Hamas says strike is a serious escalation

Hamas said the strike was a horrific crime and a serious escalation. Izzat El-Reshiq, a member of Hamas's political office, said the dead did not include a "single combatant."

Tens of thousands of displaced Palestinians have sought shelter in Gaza's schools, most of which have stopped functioning since the start of the war 10 months ago.

A separate strike on Saturday killed three Palestinians in Al-Nuseirat, in central Gaza and another killed one person in the nearby Deir Al-Balah city, medics said.

Images from Gaza City show the aftermath of Israel's strike as people mourn over lost loved ones.

Nabil Abu Rudeine, a spokesperson for Palestinian President Mahmoud Abbas, urged Israel's ally Washington to put an end to the "blind support that leads to the killing of thousands of innocent civilians, including children, women, and the elderly."

Egypt, Qatar and Saudi Arabia condemned the strike, which came as mediators were pushing to resume ceasefire talks. Senior Hamas official Sami Abu Zuhri said the strike should serve as a turning point in their efforts.

Egypt said that the killing of Gaza civilians showed Israel had no intention to end the war. Qatar's foreign ministry described the strike as a "horrific massacre."

Egypt, the United States and Qatar have scheduled a new round of ceasefire negotiations for Thursday, as fears are growing of a broader conflict, involving Iran and its Lebanese ally Hezbollah.

Israeli Prime Minister Benjamin Netanyahu, who has said he will not end the war until Hamas no longer poses a threat to Israelis, said a delegation would be sent to the Aug. 15 talks.

A Hamas official told Reuters the group was studying the new offer for talks but did not elaborate.

Israel launched its assault on Gaza after Hamas fighters stormed into southern Israel on Oct. 7, killing 1,200 people, mostly civilians, and capturing more than 250 hostages, according to Israeli tallies.

Since then, nearly 40,000 Palestinians have been killed in the Israeli offensive in Gaza, according to the health ministry, which does not distinguish between combatants and civilians.

Health officials say most of the fatalities have been civilians. Israel, which has lost 329 soldiers in Gaza, says at least a third of the Palestinian fatalities are fighters. Iran-backed Hamas does not publish its casualties.