The U.S. said negotiations on a Gaza ceasefire should be able to close the gaps between Israel and Hamas while Israeli forces seized the main border crossing in Rafah on Tuesday, closing a vital route for aid, Reuters reported.

Hamas official Osama Hamdan, speaking to reporters in Beirut, warned that if Israel’s military aggression continued in Rafah, there would be no truce agreement.

The Palestinian militant group accused Israel of undermining ceasefire efforts in the seven-month-long war that has laid waste to Gaza and left hundreds of thousands of its people homeless and hungry.

The truce comments came as Israel invaded Rafah, a southern Gazan city where more than one million displaced Palestinian civilians have sought shelter from Israel’s offensive throughout the tiny territory.

White House spokesperson John Kirby said Hamas offered amendments on Monday to an Israeli proposal aimed at ending the impasse. The deal text, as amended, suggests the remaining gaps can “absolutely be closed,” he said. He declined to specify what those were.

Israel on Monday said a three-phase proposal that Hamas approved was unacceptable.

Kirby said mediators from Qatar and Egypt along with U.S. and Israeli officials were gathering in Cairo. Hamas separately said its delegation was in Cairo as well.

OFFENSIVE

Israel’s seizure of the Rafah crossing came despite weeks of calls that the U.S., other nations and international bodies hoped would deter a big offensive in the Rafah area – which Israel says is Hamas fighters’ last stronghold, read the report.

Israeli army footage showed tanks rolling through the Rafah crossing complex between Gaza and Egypt, and the Israeli flag raised on the Gaza side.

Israeli Prime Minister Benjamin Netanyahu said seizing the crossing was a “very significant step” toward Israel’s stated aim of destroying Hamas’s military capabilities.

Residents reported heavy tank shelling on Tuesday evening in some areas of eastern Rafah. A Rafah municipal building caught fire after Israeli shelling, residents and Hamas media said. Medics said one Palestinian was killed and several wounded in the building while an Israeli strike also killed two Palestinians on a motorcycle.

Health officials said Abu Yousef Al-Najar, the main hospital in Rafah, closed on Tuesday after heavy bombardment nearby led medical staff and around 200 patients to flee, Reuters reported.

“They have gone crazy. Tanks are firing shells and smoke bombs cover the skies,” said Emad Joudat, 55, a Gaza City resident displaced in Rafah.

“I am now seriously thinking of heading north, maybe to the central Gaza area. If they move further into Rafah, it will be the mother of massacres,” he told Reuters via a chat app.

Many of those in Rafah were previously displaced from other parts of Gaza following Israel’s orders to evacuate from there.

Families have been crammed into tented camps and makeshift shelters, suffering from shortages of food, water, medicine and other essentials.

The U.N. and other international aid agencies said the closing of the two crossings into southern Gaza – Rafah and Israeli-controlled Kerem Shalom – had virtually cut the enclave off from outside aid and very few stores were available inside.

Red Crescent sources in Egypt said shipments had completely halted. “These crossings are a lifeline… They need to be reopened without any delay,” Philippe Lazzarini, head of U.N. aid agency UNRWA, said on X.

Separately, Jordan said Israeli settlers attacked a humanitarian convoy on its way to a crossing in northern Gaza.

The White House said it had been told the Kerem Shalom crossing would re-open on Wednesday and fuel deliveries through Rafah would resume then too.

U.N. Secretary-General Antonio Guterres appealed to Israel and Hamas to spare no effort to get a truce deal. “Make no mistake – a full-scale assault on Rafah would be a human catastrophe,” Guterres said.

‘PANIC AND DESPAIR’

Israel’s military said it was conducting a limited operation in Rafah to kill fighters and dismantle infrastructure used by Hamas, which runs Gaza. It told civilians to go to what it calls an “expanded humanitarian zone” some 20 km (12 miles) away.

In Geneva, U.N. humanitarian office spokesperson Jens Laerke said “panic and despair” were gripping the people in Rafah.

Civilians did not have enough time to prepare for evacuation and no safe route to travel, he said. The roads are “littered with unexploded ordnance, massive bombs lying in the street. It’s not safe,” he said.

Critics of the Gaza war have urged U.S. President Joe Biden to pressure Israel to change course. The U.S., Israeli’s closest ally and main weapons supplier, has delayed some arms shipments to Israel for two weeks, according to four sources on Tuesday.

The White House and Pentagon declined comment, but this would be the first such delay since the Biden administration offered its full support to Israel after Hamas’ Oct. 7 attack, read the report.

Israel’s offensive has killed 34,789 Palestinians, most of them civilians, in the conflict, the Gaza Health Ministry said.

The war began when Hamas militants attacked Israel on Oct. 7, killing about 1,200 people and abducting about 250 others, of whom 133 are believed to remain in captivity in Gaza, according to Israeli tallies.

Any truce would be the first pause in fighting since a week-long ceasefire in November during which Hamas freed around half of the hostages and Israel released 240 Palestinians it was holding in its jails.

Since then, all efforts to reach a new truce have foundered over Hamas’ refusal to free more hostages without a promise of a permanent end to the conflict, and Israel’s insistence that it would discuss only a temporary pause.