President Joe Biden on Wednesday publicly warned Israel for the first time that the U.S. would stop supplying it weapons if Israeli forces make a major invasion of Rafah, a refugee-packed city in southern Gaza, Reuters reported.

“I made it clear that if they go into Rafah …, I’m not supplying the weapons that have been used historically to deal with Rafah, to deal with the cities – that deal with that problem,” Biden said in an interview with CNN.

Biden’s comments represent his strongest public language to date in his effort to deter an Israeli assault on Rafah while underscoring a growing rift between the U.S. and its strongest ally in the Middle East.

Biden acknowledged U.S. weapons have been used by Israel to kill civilians in Gaza, where Israel has mounted a seven-month-old offensive aimed at annihilating Hamas. Israel’s campaign has so far killed 34,789 Palestinians, mostly civilians, the Gaza Health Ministry said.

“Civilians have been killed in Gaza as a consequence of those bombs and other ways in which they go after population centers,” he said when asked about 2,000-pound bombs sent to Israel.

A senior U.S. official, speaking on condition of anonymity, said Washington had carefully reviewed the delivery of weapons that might be used in Rafah and as a result paused a shipment consisting of 1,800 2,000-pound (907-kg) bombs and 1,700 500-pound bombs.

Israel’s U.N. ambassador, Gilad Erdan, earlier this week called Washington’s decision to delay shipments “very disappointing” although he did not believe the U.S. would stop supplying arms to Israel.

Israel this week attacked Rafah, where more than one million Palestinians have sought refuge, but Biden said he did not consider Israel’s strikes a full-scale invasion because they have not struck “population centers.”

The interview was released hours after Defense Secretary Lloyd J. Austin III acknowledged publicly Biden’s decision last week to hold up the delivery of thousands of heavy bombs was taken out of concern for Rafah, where Washington opposes a major Israeli invasion without civilian safeguards, read the report.

Israel’s campaign in Gaza was triggered by Hamas ‘ Oct. 7 attack on Israel. That killed about 1,200 people with about 250 others abducted, of whom 133 are believed to remain in captivity in Gaza, according to Israeli tallies.

The United States is by far the biggest supplier of weapons to Israel, and it accelerated deliveries after the Oct. 7 Hamas-led attacks, Reuters reported.

In 2016, the U.S. and Israeli governments signed a third 10-year Memorandum of Understanding that provides $38 billion in military aid over the 10 years, $33 billion in grants to buy military equipment and $5 billion for missile defense system. Last month, congress approved $26 billion in additional funding for Israel.

Biden said the U.S. would continue to provide defensive weapons to Israel, including for its Iron Dome air defense system.

“We’re going to continue to make sure Israel is secure in terms of Iron Dome and their ability to respond to attacks that came out of the Middle East recently,” he said. “But it’s, it’s just wrong. We’re not going to – we’re not going to supply the weapons and artillery shells.”

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.

Hamas on Monday agreed to a Gaza ceasefire proposal from mediators, but Israel said the terms did not meet its demands and pressed ahead with strikes in Rafah while planning to continue negotiations on a deal.

The developments in the seven-month-old war came as Israeli forces struck Rafah on Gaza’s southern edge from the air and ground and ordered residents to leave parts of the city, which has been a refuge for more than a million displaced Palestinians.

Hamas said in a brief statement that its chief, Ismail Haniyeh, had informed Qatari and Egyptian mediators that the group accepted their proposal for a ceasefire.

Israeli Prime Minister Benjamin Netanyahu’s office said later that the truce proposal fell short of Israel’s demands but Israel would send a delegation to meet with negotiators to try to reach an agreement.

Qatar’s foreign ministry said its delegation will head to Cairo on Tuesday to resume indirect negotiations between Israel and Hamas.

In a statement, Netanyahu’s office added that his war cabinet approved continuing an operation in Rafah. Jordan’s Foreign Minister Ayman Safadi said on social media site X that Netanyahu was jeopardizing a ceasefire by bombing Rafah.

An Israeli official, speaking on condition of anonymity, said the proposal that Hamas approved was a watered-down version of an Egyptian offer and included elements that Israel could not accept.

“This would appear to be a ruse intended to make Israel look like the side refusing a deal,” said the Israeli official.

U.S. State Department spokesman Matthew Miller said Washington would discuss the Hamas response with its allies in the coming hours, and a deal was “absolutely achievable”.

More than 34,600 Palestinians have been killed in the conflict, according to Gaza health officials. The U.N. has said famine is imminent in the enclave.

The war began when Hamas attacked Israel on Oct. 7, killing about 1,200 people and abducting 252 others, of whom 133 are believed to remain in captivity in Gaza, according to Israeli tallies.

RAFAH HIT BY STRIKES

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.

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.

Taher Al-Nono, a Hamas official and adviser to Haniyeh, told Reuters the proposal met the group’s demands for reconstruction efforts in Gaza, return of displaced Palestinians and a swap of Israeli hostages for Palestinian prisoners in Israeli jails.

The Hamas deputy chief in Gaza, Khalil Al-Hayya, told Al Jazeera television the proposal comprised three phases of six weeks each, with Israel to pull its troops out of Gaza in the second phase.

Earlier on Monday, Israel ordered the evacuation of parts of Rafah, the city on the Egyptian border that has served as the last sanctuary for around half of Gaza’s 2.3 million residents.

An Israeli strike on a house in Rafah killed five Palestinians, including a woman and a girl, medics said.

Israel believes that a significant number of Hamas fighters, along with potentially dozens of hostages, are in Rafah and has said that victory requires taking the key city.

Israel’s closest ally, the United States, has called on it not to assault Rafah, saying it must not do so without a full plan in place to protect civilians there, which has yet to be presented.

A separate U.S. official said that Washington is concerned about Israel’s latest strikes against Rafah but does not believe they represent a major military operation.

Israel said on Monday it was conducting limited operations on the eastern part of Rafah. Palestinian residents said there were massive air strikes.

“They have been firing since last night and today after the evacuation orders, the bombardment became more intense because they want to frighten us to leave,” Jaber Abu Nazly, a 40-year-old father of two, told Reuters via a chat app.

“Others are wondering whether there is any place safe in the whole of Gaza,” he added.

Instructed by Arabic text messages, phone calls and flyers to move to what the Israeli military called an “expanded humanitarian zone” around 20 km (12 miles) away, some Palestinian families began trundling away in chilly spring rain.

Some piled children and possessions onto donkey carts, while others left by pick-up or on foot through muddy streets.

As families dismantled tents and folded belongings, Abdullah Al-Najar said this was the fourth time he had been displaced since the fighting began seven months ago.

“God knows where we will go now. We have not decided yet.”

(Reuters)