The World Health Organization insisted Tuesday that moving the most vulnerable patients from Gaza's Al-Shifa hospital has become an "impossible task".
The Israeli mission in Geneva had at the weekend slammed the WHO, the UN humanitarian agency OCHA and the International Committee of the Red Cross (ICRC) for criticising Israel's month-long call for civilians and patients to leave the Palestinian enclave's main hospital.
Israel has faced growing international pressure over its offensive the since the October 7 Hamas attacks.
Israel says 1,200 people, mainly civilians, were killed in the attacks and 239 people taken hostage. Gaza's Hamas-run health ministry says at least 11,240 people have been killed in Israel's air and ground campaign since.