It comes after Israel said it would stop all goods and supplies into Gaza, a move condemned by humanitarian groups and Hamas, which called it "a war crime and a blatant attack" on a truce that took a year of negotiations before taking hold in January.

The United Nations on Sunday called on Israel to immediately allow aid into Gaza, hours after it suspended humanitarian deliveries into the war-battered territory as talks on a truce extension appeared to hit an impasse.

Hamas accused Israel of trying to derail the cease-fire agreement hours after its first phase ended. It called the decision to cut off aid “cheap extortion, a war crime and a blatant attack” on the truce, which took hold in January after more than a year of negotiations. Both sides stopped short of saying the cease-fire had ended.