Israel says it examined bodies previously buried by Palestinians near Nasser hospital while checking to see if any of its hostages were among the dead. It says claims it buried the bodies initially are “baseless and unfounded”.
The UN’s human rights chief has said he is “horrified” by reports of mass graves containing hundreds of bodies in Gaza.
Palestinian authorities said they were uncovered at Nasser hospital in the central city of Khan Younis, and at al Shifa hospital in Gaza City.
Some had their hands tied and were “stripped of their clothes”, said Ravina Shamdasani, spokesperson for UN human rights commissioner Volker Turk.
“The intentional killing of civilians, detainees and others who are hors de combat [not participating in hostilities] is a war crime,” said Mr Turk in a statement.
More than 300 bodies were found at one grave at Nasser, according to the Palestinian health ministry, with two more sites found but not yet excavated.
Some were allegedly older people, women, and the wounded, the UN said.
