The Nasser Hospital in Gaza is no longer functioning after a raid by Israeli special forces, the World Health Organization said.
WHO teams were not permitted to enter the hospital in southern Gaza on Friday or Saturday "to assess the conditions of the patients and critical medical needs," WHO Director-General Tedros Adhanom Ghebreyesus said in the statement posted on X, adding scores of patients remain inside.
"There are still about 200 patients in the hospital. At least 20 need to be urgently referred to other hospitals to receive health care; medical referral is every patient’s right," he continued.
"The cost of delays will be paid by patients’ lives," Tedros added, before urging that access to the patients and hospital should be facilitated for WHO staff.
Nasser Hospital was previously the largest remaining functioning medical facility in the Gaza Strip.
The Israeli military claims they have credible evidence that Hamas had previously held hostages at the hospital, and that the bodies of deceased hostages may be at the hospital. However, it has not publicly released that evidence.
CNN has reached out to the Israeli military regarding Tedros' claims.
Nasser Hospital has experienced critical shortages of fuel, oxygen and medical supplies. Before the Israeli military's raid on it on Thursday, hundreds of civilians were forced by Israeli forces to leave the hospital, which they had been using as a shelter.