KHAN YOUNIS, Gaza Strip — Health officials and people trapped inside Gaza’s largest hospital rejected Israel’s claims that it was helping babies and others evacuate Sunday, saying fighting continued just outside the facility where incubators lay idle with no electricity and critical supplies were running out.

Prime Minister Benjamin Netanyahu has dismissed urgent international calls for a cease-fire unless it includes the release of all the nearly 240 hostages captured by Hamas in the Oct. 7 rampage that triggered the war.

A day after Netanyahu said Israel was bringing its “full force” with the aim of ending Hamas’ 16-year rule in Gaza, residents reported heavy airstrikes and shelling, including around Shifa Hospital. Israel, without providing evidence, has accused Hamas of concealing a command post inside and under the compound, allegations denied by Hamas and hospital staff.

“They are outside, not far from the gates,” said Ahmed al-Boursh, a resident sheltering there.

The hospital’s last generator ran out of fuel Saturday, leading to the deaths of three premature babies and four other patients, according to the Hamas-run Health Ministry. It said another 36 babies are at risk of dying.

Israel’s military asserted it placed 79 gallons of fuel near Shifa overnight for an emergency generator powering incubators for premature babies and coordinated the delivery with hospital officials. “Sadly, they haven’t taken the fuel yet,” spokesperson Lt. Col. Richard Hecht said.

He said if this fuel doesn’t work, they will seek “other solutions for the babies.”

A Health Ministry spokesperson, Ashraf al-Qidra, told Al Jazeera the fuel would not be enough to operate the generator an hour. “This is a mockery towards the patients and children,” Al-Qidra said.

Speaking to CNN, Netanyahu asserted that “100 or so” people had been evacuated from Shifa and that Israel had created safe corridors.

But Health Ministry Undersecretary Munir al-Boursh said Israeli snipers have deployed around Shifa, firing at any movement.

“There are wounded in the house, and we can’t reach them,” he told Al Jazeera. “We can’t stick our heads out of the window.”

The Health Ministry said there are 1,500 patients at Shifa, along with 1,500 medical personnel and between 15,000 and 20,000 people seeking shelter.

The president of Doctors Without Borders International, Christos Christou, told CBS’ “Face the Nation” it would take weeks to evacuate the patients.

World Health Organization Director-General Tedros Adhanom Ghebreyesus said on X, formerly Twitter, that Shifa has been without water three days and “is not functioning as a hospital anymore.” Several humanitarian groups told The Associated Press they weren’t able to reach the hospital Sunday.

Alarm was growing. “We do not want to see a firefight in a hospital where innocent people, helpless people, people seeking medical care are caught in the crossfire,” President Biden’s national security adviser, Jake Sullivan, told ABC’s “This Week.”

“Decisive international action is needed now to secure an immediate humanitarian cease-fire” amid attacks on health care, the U.N. regional directors of the World Health Organization and others said in a statement, adding that more than half of Gaza’s hospitals are closed.