The alleged acts may "amount to serious crimes under international criminal law," said the experts, pointing to reports of violence and sexual assault.
In a surprise move ahead of the vote, the United States circulated a rival U.N. Security Council resolution that would support a temporary cease-fire in Gaza.
The proposed resolution says Israel’s planned major ground offensive into the southern Gaza city of Rafah “should not proceed under current circumstances.”
The International Court of Justice opens historic hearings over Israel’s 57-year occupation that Palestinians and rights groups say amounts to apartheid.
The comments come as a right-wing Israeli War Cabinet member threatens to invade Rafah if all remaining hostages are not freed by Ramadan.
UNRWA has provided direct relief and aid to Palestinians for 75 years. Damaging claims by Israel have left its fate in question.
Israel walked back its commitment to keep the southernmost city safe and announced forces are preparing for a ground invasion there.
Democrats made a stunning turn-around in joining Republicans to cut off future and current funding for the United Nations Relief and Works Agency, the chief aid group helping Gaza.
The largest aid organization in war-torn Gaza is the "identical twin" of Hamas, one lawmaker said.
Israel said the discussion was still constructive, a tentative sign of progress on a potential agreement for paused violence in exchange for hostages released.