Israel stopped the entry of all goods and supplies into the Gaza Strip on Sunday and warned of “additional consequences” if Hamas does not accept a new proposal for an extension of the first phase of a fragile ceasefire.

Hamas accused Israel of trying to derail the truce and said its decision to cut off aid was “cheap extortion, a war crime and a blatant attack on the (ceasefire) agreement.” Both sides stopped short of saying the ceasefire had ended.

The first phase of the ceasefire, which included a surge in humanitarian assistance, expired on Saturday. The two sides have yet to negotiate the second phase, in which Hamas was to release dozens of remaining hostages in return for an Israeli pullout and a lasting ceasefire.