The largest hospital in Gaza has ceased to function and fatalities among patients are rising, the head of the World Health Organization (WHO) said Sunday, as a blistering Israeli assault continues in the Hamas-controlled strip.

Hospitals in the north of the Palestinian enclave, including the Shifa complex, are blockaded by Israeli forces and barely able to care for those inside, with three newborns dead at Shifa and more at risk from power outages amid intense fighting nearby, according to medical staff.

Israel says it is homing in on Palestinian Hamas militants who launched deadly attacks in southern Israel on Oct. 7, and says the group has command centers under and near the hospitals.