At least 28 people, including children, have been killed in a wave of Israeli military strikes in the Gaza Strip, according to the Gaza Civil Defense Agency.
A school housing displaced families was among the facilities hit, killing eight people, including four children, over the weekend, the agency said.
It comes as the UN called on Israel to halt its attacks near a hospital in northern Gaza.
The Israeli military said a Hamas command center was in the Musa bin Nusair school compound in Gaza City and did not comment on reports of attacks from the hospital.
“Hamas systematically violates international law,” the Israel Defense Forces (IDF) said on social media, adding that Israel's response would be “to act with force and determination against terrorist organizations.”
Gaza Civil Defense Agency spokesman Mahmoud Bassal told AFP that the school had been repurposed as a shelter for Palestinians displaced by the war.
One displaced man who was staying at the school, Abu, told BBC Arabic that the attack came while he was sleeping.
“We were sleeping peacefully, then suddenly we woke up to the sound of a very powerful explosion,” he said.
Another man, Mahmoud, said he was sleeping in a tent in the schoolyard when the attack took place.
“Stones and shrapnel were flying, the walls of the school fell on our heads,” he told BBC Arabic.
On Sunday, Pope Francis condemned Israeli attacks on Gaza for the second day in a row.
He expressed pain as he thought “of such cruelty, of the machine-gun shooting of children, of the bombing of schools and hospitals.”
The director of Kamal Adwan Hospital, Dr Hussam Abu Safiya, said its generators had been hit and claimed the Israeli army had targeted the fuel tank.
The head of the World Health Organization (WHO), Dr. Tedros Adhanom Ghebreyesus, called on the IDF to end attacks near the hospital.
Saturday night's reports of a “bombing near Kamal Adwan Hospital and the order to evacuate the hospital are deeply disturbing,” he said in a statement on social media.
“We call for an immediate ceasefire in the vicinity of the hospital and for the protection of patients and health workers.
The hospital's director also released a statement saying Israeli forces were treating the hospital “as if we were a military installation.”
“Anyone who goes outside the hospital is at risk of being attacked,” said Dr. Hussam Abu Safiya.
He added that moving the hospital's operations would put patients at risk and called for health staff “to be allowed to work without the threat of evacuation.”
Israel has not commented on reports of an evacuation order.
The BBC has approached the IDF for comment.
Palestinian groups involved in the fighting told the BBC ceasefire agreement 'closer than ever'.
More than 45,000 Palestinians are killed during the 14-month war between Israel and Hamas, according to data from the Hamas-run Gaza Health Ministry.
The war began when gunmen led by Hamas launched an unprecedented attack on southern Israel on October 7, 2023, in which around 1,200 people were killed and another 251 taken hostage.