US President Donald Trump said Hamas must agree to a proposed peace deal for Gaza by Sunday evening, threatening an even greater military onslaught nearly two years into the war sparked by the October 7 attack into Israel.

Trump appears keen to deliver on pledges to end the war and return dozens of hostages ahead of the second anniversary of the attack on Tuesday. His peace plan has been accepted by Israel and welcomed internationally, but key mediators Egypt and Qatar, and at least one Hamas official, have said some elements need further negotiation, without elaborating.

“An Agreement must be reached with Hamas by Sunday Evening at SIX (6) P.M., Washington, D.C. time,” Trump wrote Friday on social media. “Every Country has signed on! If this LAST CHANCE agreement is not reached, all HELL, like no one has ever seen before, will break out against Hamas. THERE WILL BE PEACE IN THE MIDDLE EAST ONE WAY OR THE OTHER.”

Under the plan, which Trump unveiled earlier this week alongside Israeli Prime Minister Benjamin Netanyahu, Hamas would immediately release the remaining 48 hostages – around 20 of them believed to be alive. It would also give up power and disarm.

In return, Israel would halt its offensive and withdraw from much of the territory, release hundreds of Palestinian prisoners and allow an influx of humanitarian aid and eventual reconstruction. Plans to relocate much of Gaza’s population to other countries would be shelved.

The territory of some 2 million Palestinians would be placed under international governance, with Trump himself and former British prime minister Tony Blair overseeing it. The plan provides no path for eventual reunification with the Israeli-occupied West Bank in a future Palestinian state.