More than 338,000 Palestinians have been displaced by the conflict between Israel and Hamas, said Stéphane Dujarric, spokesperson for UN's secretary-general.
Nearly 218,000 of those are sheltering in 92 schools run by the UN Relief and Works Agency, Dujarric said Thursday.
Airstrikes have hit at least 88 education facilities, including 18 UNRWA schools and 70 Palestinian Authority schools, according to the UN. Two of the UNRWA facilities were being used as emergency shelters for displaced people, the UN added.
"This means that for the sixth consecutive day, more than 600,000 children have had no access to education in a safe place in Gaza,” Dujarric said.
The UNRWA said 12 of its personnel have been killed since October 7.
The UN has warned the situation in Gaza is continuing to worsen as humanitarian organizations are unable to bring aid into the sealed-off enclave.
The World Health Organization said the hospitals in Gaza are "at a breaking point."
Earlier Thursday, the International Committee of the Red Cross warned hospitals in Gaza "risk turning into morgues" as they lose power during Israel's bombardment of the enclave. And shortages of food, water and electricity have already been putting extra strain on medical facilities.
The World Food Programme (WFP) said it has plans to work with the UNRWA to “reach over 800,000 people across Palestine”. On Wednesday, the WFP said it delivered food to over 175,000 displaced people across 88 shelters.