The United Nations called Tuesday for an international investigation into reports of mass graves at two Gaza
 hospitals destroyed in Israeli sieges, saying war crimes might have been committed.

 The UN rights office said it was "horrified" by the destruction of Gaza's biggest hospital, Al-Shifa in Gaza City, and its second largest, the Nasser Medical Complex in Khan Yunis, reports AFP.

Israel's army dismissed claims that its troops had buried bodies during its operation at Nasser as "baseless and unfounded".

The UN rights office demanded "independent, effective and transparent investigations into the deaths".

"Given the prevailing climate of impunity, this should include international investigators," UN rights chief Volker Turk said in a statement.

Hospitals, which are protected under international law, have repeatedly come under Israeli bombardment over more than six months of war in Gaza.

Israel has accused Palestinian militant group Hamas of using medical facilities as command centres and to hold hostages abducted during its attack inside Israel on October 7.

 Hamas has denied the claims.
       
 - 'War crime' -

"Hospitals are entitled to very special protection under international humanitarian law," Turk said. "And the intentional killing of civilians, detainees and others who are hors de combat is a war crime."

The UN rights office said it did not have access to independent information as to what happened at the two hospitals.

But spokeswoman Ravina Shamdasani said efforts were under way to corroborate reports and details given by Gazan authorities.

"Victims had reportedly been buried deep in the ground and covered with waste," she told reporters in Geneva, adding that older people, women and wounded were reportedly among the dead.

Others were allegedly "found with their hands tied and stripped of their clothes".

As for Al-Shifa, the Israeli army has said around 200 Palestinians were killed during its military operation there.

The World Health Organization earlier this month described that hospital as an "empty shell" containing many bodies.

Around 30 bodies were reported found buried in two graves in the courtyard of Al-Shifa.

"And there are reports that the hands of some of these bodies were also tied," Shamdasani said, which would constitute "serious violations" of international law.

Bd-pratidin English/Lutful Hoque