An Israeli air strike has hit a Gaza City hospital packed with wounded and other Palestinians seeking shelter, killing hundreds, according to the Gaza Health Ministry.

If confirmed, the attack would be by far the deadliest Israeli air strike in five wars fought since 2008.

Photos from the al-Ahli Hospital showed fire engulfing the hospital halls, shattered glass and bodies scattered across the area. The photos could not be independently verified.

The ministry, which is run by Hamas, said at least 500 people had been killed.

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Palestinians look for survivors after Israeli air strikes in Khan Younis (Fatima Shbair/AP)

Hamas called the hospital strike “a horrific massacre”. It said in a statement that most of the casualties were displaced families, patients, children and women.

Several hospitals in Gaza City have become refuges for hundreds of people, hoping they would be spared bombardment after Israel ordered all residents of the city and surrounding areas to evacuate to the southern Gaza Strip.

Israeli military spokesman Rear Admiral Daniel Hagari said there were still no details on the hospital deaths, adding: “We will get the details and update the public. I don’t know to say whether it was an Israeli air strike.”

In the south, continued strikes killed dozens of civilians and at least one senior Hamas figure on Tuesday in attacks it says are targeted at militants.

US officials worked to convince Israel to allow delivery of supplies to desperate civilians, aid groups and hospitals after days of failed hopes for an opening in the siege.

With Israel barring entry of water, fuel and food into Gaza since the brutal attack by Hamas more than a week ago, US secretary of state Antony Blinken secured an agreement with Israeli Prime Minister Benjamin Netanyahu to discuss creation of a mechanism for delivering aid to the territory’s 2.3 million people.

US officials said the gain might appear modest, but stressed that it was a significant step forward.

Still, as of late Tuesday, there was no deal in place.

A top Israeli official said on Tuesday his country was demanding guarantees that Hamas militants would not seize any aid deliveries.

Tzahi Hanegbi, head of Israel’s National Security Council, suggested entry of aid also depended on the return of hostages held by Hamas.

“The return of the hostages, which is sacred in our eyes, is a key component in any humanitarian efforts,” he told reporters, without elaborating whether Israel was demanding the release of all of the roughly 200 people Hamas abducted before allowing supplies in.

US President Joe Biden prepared to head to the region as he and other world leaders tried to prevent the war from sparking a broader regional conflict.

Israel-Hamas war: key locations
(PA Graphics)

Violence flared on Tuesday along Israel’s border with Lebanon, where Iranian-backed Hezbollah militants operate.

With tens of thousands of troops massed along the border, Israel has been expected to launch a ground invasion into Gaza — but plans remained uncertain.

“We are preparing for the next stages of war,” military spokesman Lt Col Richard Hecht said. “We haven’t said what they will be. Everybody’s talking about a ground offensive. It might be something different.”

In Gaza, dozens of injured were rushed to hospitals after heavy attacks outside the southern cities of Rafah and Khan Younis, residents reported.

Bassem Naim, a senior Hamas official and former health minister, reported 27 people were killed in Rafah and 30 in Khan Younis. An Associated Press reporter saw around 50 bodies brought to the Nasser Hospital in Khan Younis.

An air strike in Deir al Balah reduced a house to rubble, killing a man and 11 women and children inside and in a neighbouring house, some of whom had evacuated from Gaza City. Witnesses said there was no warning before the strike.

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Rockets are fired towards Israel from the Gaza Strip (Leo Correa/AP)

Shelling from Israeli tanks hit a UN school in central Gaza where 4,000 Palestinians had taken refuge, killing six people and wounding dozens, the United Nations Palestinian refugee agency said. At least 24 UN installations have been hit the past week, killing at least 14 of the agency’s staff.

The Israeli military said it was targeting Hamas hideouts, infrastructure and command centres.

A barrage of strikes crashed into the Bureij refugee camp in central Gaza, levelling an entire block of homes and causing dozens of casualties among families inside, residents said.

Among those killed was one of Hamas’ top military commanders, Ayman Nofal, the group’s military wing said — the most high-profile militant known to have been killed so far in the war.

Nofal, formerly the intelligence chief of Hamas’ armed wing, was in charge of Hamas militant activities in the central Gaza Strip, including co-ordinating activities with other militant groups.

Mr Netanyahu sought to put the blame on Hamas for Israel’s retaliatory attacks and the rising civilian casualties in Gaza.

“Not only is it targeting and murdering civilians with unprecedented savagery, it’s hiding behind civilians,” he said.

APTOPIX Israel Palestinians
Palestinians evacuate a survivor from a house hit by an Israeli air strike in Khan Younis (Mohammed Dahman/AP)

In Gaza City, Israeli air strikes also hit the house of Hamas’ top political official, Ismail Haniyeh, killing at least 14 people.

Mr Haniyeh is based in Doha, Qatar, but his family lives in Gaza City. The Hamas media office did not immediately identify those killed.

Israel sealed off Gaza after the Hamas attack on southern Israel on October 7 that killed more than 1,400 people, mostly civilians, and resulted in some 200 taken captive into Gaza.

Hamas militants in Gaza have launched rockets every day since, aiming at cities across Israel.

Israeli strikes on Gaza have killed at least 2,778 people and wounded 9,700, according to the Gaza Health Ministry. Nearly two thirds of those killed were children, a ministry official said.

Another 1,200 people across Gaza are believed to be buried under the rubble, alive or dead, health authorities said.

More than one million Palestinians have fled their homes — roughly half of Gaza’s population — and 60% are now in the approximately eight-mile long area south of the evacuation zone, the UN said.

Aid workers warned that the territory was near complete collapse. Hospitals were on the verge of losing electricity, threatening the lives of thousands of patients, and hundreds of thousands of people searched for bread and water.

The UN agency for Palestinians said more than 400,000 displaced people are crowded into schools and other facilities in the south. The agency said it has only one litre of water a day for each of its staff members trapped in the territory.

Israel opened a water line into the south for three hours that benefited only 14% of Gaza’s population, the UN said.

At the Rafah crossing, Gaza’s only connection to Egypt, truckloads of aid were waiting to enter. The World Food Programme said that it had more than 300 tons of food waiting to cross into Gaza.

Civilians with foreign citizenship — many of them Palestinians with dual nationalities — also waited in Rafah, desperate to get out.

“We come to the border crossing hoping that it will open, but so far there is no information,” said Jameel Abdullah, a Swedish citizen.

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Palestinians wait to cross into Egypt at the Rafah border crossing (Fatima Shbair/AP)

Repeated reports that an opening was imminent have proven false as negotiations continued to grind on, including the US, Israel and Egypt.

A senior Egyptian official called it a “very tough, complicated back-and-forth process” and said talks were over deliveries through Rafah and Israel’s Karam Shalom crossing to Gaza.

He said Israel was insisting to search all aid, and wants to “ensure that such aid won’t benefit Hamas.”

He said Egypt proposed that the UN oversee the whole process, including inside Gaza.

Officials for Hamas and Israel cast doubt on an immediate opening, saying they were unaware of an agreement.

Mr Blinken arrived in Israel last Thursday with a full-throated message of unequivocal US support for Israel in its campaign to destroy Hamas. But in meetings with seven Arab leaders over the next three days, Mr Blinken’s tone shifted subtly, talking more prominently about the need for humanitarian aid.

US officials said it had become clear by then that already limited Arab tolerance of Israel’s military operations would evaporate entirely if conditions in Gaza worsened.

Mr Biden’s visit to Israel on Wednesday will signal the White House’s support for a key ally. He will also travel to Jordan to meet Arab leaders amid fears the fighting could spread in the region.

Israel evacuated towns near its northern border with Lebanon, where the military has exchanged fire repeatedly with Hezbollah militants.

Israel said it killed four militants wearing explosive vests who were attempting to cross into the country from Lebanon on Tuesday morning. No group immediately claimed responsibility.

Iran’s Supreme Leader Ayatollah Ali Khamenei warned that Israel’s continuing offensive in Gaza could cause a violent reaction across the region.

“Bombardments should be immediately stopped. Muslim nations are angry,” he said, according to state media.