A north Gaza hospital that Israeli troops raided is out of service and patients including babies have been evacuated, putting the enclave's collapsing health services in further peril, a World Health Organization official warned on Monday.

Gazan authorities said Israeli forces last week used a bulldozer to smash through the perimeter of the Kamal Adwan hospital, forcing out and killing displaced people.

"What we understand is it's not functional anymore," Richard Peeperkorn, WHO representative for Gaza, told Reuters.

He said two newborn babies were taken home "to their families and with a description how to take care of them", while other patients including infants were evacuated to Al Ahli and Al Shifa hospitals. "Many health workers were reportedly detained", he said.

World Health Organization Director General Tedros Adhanom Ghebreyesus said that a UN team that visited Nasser Hospital “found deeply concerning conditions” following an Israeli attack on the medical facility’s pediatric unit, which killed a child who had already been seriously wounded in a separate attack in which she lost her family.

“Nasser’s ability to function has deteriorated drastically since WHO’s last visit on 7 December,” Ghebreyesus said in a social media post.

He said more than 1,000 patients and 4,000 internally displaced people in Gaza continue to seek shelter at the medical facility.

“Health workers told WHO colleagues they fear for their lives and are not sure how long they can remain safely at Nasser,” he added, before urging an “immediate ceasefire” between Israel and Hamas.

Israel's air and ground attacks on the Gaza Strip since an Oct. 7 attack by Hamas have killed at least 19,453 Palestinians, mostly women and children, and injured 52,286, according to health authorities in the besieged enclave.

The war has left Gaza in ruins with half of the coastal territory's housing stock damaged or destroyed, and nearly 2 million residents displaced within the densely-populated enclave amid shortages of food and clean water.