U.S. Secretary of State Antony Blinken said Monday that Israel has accepted a proposal to bridge differences holding up a cease-fire and hostage release in Gaza, and he called on Hamas to do the same, without saying whether concerns cited by the militant group had been addressed.

The high-stakes negotiations have gained urgency in recent days as diplomats hope an agreement will deter Iran and Lebanon's Hezbollah from avenging the targeted killings of two top militants that were blamed on Israel. The escalating tensions have raised fears of an even more destructive regional war . Blinken spoke after holding a 2 1/2 hour meeting with Israeli Prime Minister Benjamin Netanyahu earlier in the day, and will travel to Egypt and Qatar for further negotiations.

The three mediators have spent months trying to end the war in Gaza , with the talks repeatedly stalling. “In a very constructive meeting with Prime Minister Netanyahu today, he confirmed to me that Israel supports the bridging proposal,” Blinken told reporters, without saying what the proposal entails. “The next important step is for Hamas to say ‘yes.

’” He added, however, that even if Hamas accepts the proposal, negotiators will spend the coming days working on “clear understandings on implementing the agreement.” He said there are still “complex issues” requiring “hard decisions by the leaders,” without offering specifics. Hamas has said it is losing faith in the U.

S. as a mediator, accusing American .