Witnesses said Wednesdayโs attack on al-Jaouni school in the Nuseirat refugee camp tore women and children to pieces, while UNRWA said the casualties among its staff amounted to the โhighest death tollโ in a single incident in the 11-month war.
Some 12,000 displaced Palestinians, most of them women and children, were sheltering at al-Jaouni, according to UNRWA, when Israeli forces carried out two air attacks on the building.
The shelter is operated by the UN and those killed included its manager.
UNRWA announced Wednesdayโs attacks marked the fifth time the school has been hit since Israelโs war on Gaza began last October.
โNo one is safe in Gaza. No one is spared,โ it said in a post on X.
One Palestinian woman who survived the attack said she had lost all of her six children.
โAre these children terrorists? May God punish them. The Israelis destroyed our home; killed and starved our people; women are widowed and children orphaned,โ the unidentified woman told Al Jazeera in a video testimony.
โSix children โฆ What crime, what wrong did those innocent children do?โ
Another survivor said the section of the school that was hit had been โdedicated only to womenโ.
โAll of a sudden there was a huge explosion โฆ Women and children were blown to pieces. We rushed to see our children but found them torn to pieces,โ he told Al Jazeera in a video testimony.
โThis is the fifth time โ the fifth time! โ the school building has been pounded by Israeli warplanes. It is supposed to be a safe sheltering area,โ he added.
Al-Jaouni is at least the sixth school to be targeted by Israeli shelling or air raids since August 1. Tens of thousands of Palestinians driven from their homes by Israeli offensives and evacuation orders are sheltering in Gazaโs schools.
On August 1, at least 15 people were killed in an Israeli attack on the Dalal al-Mughrabi school in Gaza City, while on August 3, another 16 were killed in the bombing of the Hamama school, also in Gaza City.
On August 4, at least 30 people were killed in Israeli air raids on the Nassr and Hassan Salama schools, west of Gaza City, while on August 8, at least 17 were killed in attacks on Abdul Fattah Hamouda and az-Zahra schools, which are also located in Gaza City.
And on August 10, more than 100 people were killed and 150 others wounded after Israeli forces bombed al-Tabin school, east of Gaza City.
William Deere, director of UNRWAโs Washington Office, told Al Jazeera that Israeli forces have targeted a total of 190 UN-run facilities in the course of the war, โmany of them more than onceโ. Thatโs despite the agency sharing their GPS coordinates with the Israeli military.
He mourned the death of his colleagues, saying Israelโs war on Gaza appears to have โabsolutely no bottom to itโ.
โSix colleagues lost today, that brings the death toll among UNRWA staff in this conflict to 220, which is the highest ever in United Nations history,โ Deere told Al Jazeera. But, โour staff are on the front lines, and theyโre not going to back down, theyโre not going to stop doing their jobโ, he added.
UN Secretary-General Antonio Guterres meanwhile denounced the lack of accountability for the killings of humanitarian workers in Gaza, and called for effective investigations into their deaths.
โWe have courts, but we see that the decisions of courts are not respected, and it is this kind of limbo of accountability that is totally unacceptable and that requires also a serious a serious reflection,โ Guterres told the Reuters news agency.
The Palestinian Ministry of Health confirmed that Israelโs 11-month-old assault on Gaza has now killed at least 41,084 people and wounded another 95,029.