Hamas accused Israel of trying to derail the ceasefire 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 over a year of negotiations. Both sides stopped short of saying the ceasefire had ended.

Israel said Sunday it has stopped the entry of all humanitarian aid into Gaza after phase one of its ceasefire deal with Hamas expired, citing the militant group’s refusal of a US-backed extension.

Israel blocked aid trucks into Gaza as a cease-fire standoff has escalated, with Hamas calling on other mediators to intervene.