Dozens of bodies were found buried at the Nasser Medical Complex in Gaza, which Israel raided. The bodies include elderly women, children and young men.
Gaza's civil defence agency said its teams had discovered 50 bodies since Saturday buried in the courtyard of the Nasser Medical Complex in Gaza's main southern city of Khan Yunis.
"We... are waiting for all graves to be exhumed in order to give a final number of martyrs," Mahmud Bassal, spokesman for the civil defence agency, told AFP.
"There were no clothes on some bodies, which certainly indicates (the victims) faced torture and abuse," Bassal said.
Hamas said the 50 bodies were exhumed from the "mass grave" in the hospital's courtyard.
Israel pulled its forces from Khan Yunis on April 7 after carrying out what it called a "precise and limited operation" at the hospital, one of Gaza's biggest.
Netanyahu has also threatened action in the coming days. He has repeatedly said Israel will launch a ground assault on Rafah despite international concern for civilians who have taken refuge in the southern Gazan city.
Netanyahu's remarks came a day after the US approved $13 billion in new military aid to close ally Israel, even as global criticism mounts over the dire humanitarian crisis in the besieged Gaza Strip.
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