Doctors in the Gaza Strip say newborns and other patients are dying at the enclave's largest hospital due to a lack of electricity and medical supplies.
Israel has continued its strikes, saying Hamas is using hospitals and other facilities to hide a major command center.
Reuters news agency obtained pictures of newborns at Al-Shifa hospital. They had apparently been removed from incubators after a power outage.
Reuters reports the babies have been placed on a bed with an air conditioner providing warmth. But doctors worry the condition could cause infection and sepsis.
The hospital says six newborns and nine patients treated for illnesses or injuries have died.
The World Health Organization says Al-Shifa has been without electricity and water since Sunday and is no longer functional.
The Israeli military says it delivered 300 liters of fuel to the facility's entrance on Saturday but claims Hamas blocked the handover.
The hospital's director told Al Jazeera the supply would not have been enough.
Muhammad Abu Salmiya said, "We use 8,000 to 10,000 liters of fuel in 24 hours. The proposed 300 liters would provide power to run generators for only 30 minutes."
Local health authorities say the lives of about 650 patients are at risk, as well as 1,500 people taking shelter there.
Officials in Gaza say more than 11,000 people have died in the conflict since it erupted on October 7.
They estimate at least 3,000 remain unaccounted for, with some believed to be trapped under rubble.
Israel has logged a death toll of around 1,200, including about 360 soldiers. It says about 240 people are still being held hostage in Gaza.