Palestinians carry food supplies near a United Nations Palestinian refugee agency (UNRWA) run warehouse in Khan Younis in the southern Gaza Strip on Sunday. Reuters

Thousands of people broke into aid warehouses in Gaza to take food and "basic survival items,” a UN agency said on Sunday, in a mark of growing desperation and the breakdown of public order three weeks into the war between Israel and Gaza's Hamas rulers.

Tanks and infantry pushed into Gaza over the weekend as Israeli Prime Minister Benjamin Netanyahu announced a "second stage” in the war, three weeks after Hamas launched a brutal incursion into Israel. The widening ground offensive came as Israel pounded the territory from air, land and sea.

The bombardment –described by Gaza residents as the most intense of the war — knocked out most communications in the territory late on Friday, largely cutting off the besieged enclave’s 2.3 million people from the world. Communications were restored to many people in Gaza early on Sunday, according to local telecoms companies, Internet-access advocacy group NetBlocks.org and confirmation on the ground.

The UN agency for Palestinian refugees, known as UNRWA, provides basic services to hundreds of thousands of people in Gaza. Its schools across the territory have been transformed into packed shelters housing Palestinians displaced by the conflict. Israel has allowed only a small trickle of aid to enter from Egypt, some of which was stored in one of the warehouses that was broken into, UNRWA said.

Thousands take refuge in Shifa Hospital

Thomas White, the agency's Gaza director, said the break-ins were "a worrying sign that civil order is starting to break down after three weeks of war and a tight siege on Gaza. People are scared, frustrated and desperate," he said.

Residents living near Shifa Hospital, Gaza's largest, said Israeli airstrikes overnight on Sunday hit near the hospital complex and blocked many roads leading to it. Israel accuses Hamas of having a secret command post beneath the hospital, without providing much evidence.

A UNRWA logistics base in Gaza. File

Tens of thousands of civilians are sheltering in Shifa, which is also packed with patients wounded in the strikes.

"Reaching the hospital has become increasingly difficult,” Mahmoud al-Sawah, who is sheltering in the hospital, said over the phone. "It seems they want to cut off the area.” Another Gaza City resident, Abdallah Sayed, said the Israeli bombing over the past two days was "the most violent and intense” since the war started. Shifa in Gaza City, in the northern part of the besieged territory. Israel says most residents have heeded its orders to flee to the south, but hundreds of thousands remain in the north, in part because Israel has also bombarded targets in so-called safe zones.

13, including 10 from one family, killed in Khan Younis bombardment

An Israeli airstrike hit a two-storey house in the southern city of Khan Younis on Sunday, killing at least 13 people, including 10 from one family. The bodies were brought to the nearby Nasser Hospital, according to an Associated Press journalist at the scene.

The Israeli military had no immediate comment when asked about reports of strikes near Shifa. The army said it had struck over 450 targets over the last 24 hours, including Hamas command centres, observation posts and anti-tank missile launching positions.

The military also said more forces were sent into Gaza overnight.

The army recently released computer-generated images showing what it said were Hamas installations in and around Shifa Hospital, as well as interrogations of captured Hamas fighters who might have been speaking under duress. Israel has made similar claims before, but has not substantiated them.

Little is known about Hamas’ tunnels and other infrastructure, and the claims could not be independently verified. Hamas' government dismissed the allegations as "lies” and said they were "a precursor for striking this facility.”

A Palestine refugee woman receives food assistance at the UNRWA Khan Younis Distribution Centre in Gaza. File

The escalation ratcheted up domestic pressure on Israel's government to secure the release of some 230 hostages seized in the Oct. 7 rampage, when Hamas fighters from Gaza breached Israel's defences and stormed into nearby towns, gunning down civilians and soldiers in a surprise attack.

Israeli families back exchange of hostages for Palestinian prisoners

Desperate family members met with Netanyahu on Saturday and expressed support for an exchange for Palestinian prisoners held in Israel.

Hamas’ top leader in Gaza, Yehia Sinwar, said they "are ready immediately” to release all hostages if Israel releases all of the thousands of Palestinians held in its prisons. Rear Adm. Daniel Hagari, an Israeli military spokesman, dismissed the offer as "psychological terror.”

Netanyahu told the nationally televised news conference that Israel is determined to bring back all the hostages, and maintained that the expanding ground operation "will help us in this mission.” He said he couldn’t reveal everything that is being done due to the sensitivity and secrecy of the efforts.

"This is the second stage of the war, whose objectives are clear: to destroy the military and governmental capabilities of Hamas and bring the hostages home,” he said in his first time taking questions from journalists since the war began.

Netanyahu also acknowledged that the Oct. 7 "debacle,” in which more than 1,400 people were killed, would need a thorough investigation, adding that "everyone will have to answer questions, including me.”

The Israeli military said it was gradually expanding its ground operations inside Gaza, while stopping short of calling it an all-out invasion. Casualties on both sides are expected to rise sharply as Israeli forces and Palestinians battle in dense residential areas.

An injured woman carries a baby in the aftermath of Israeli bombing in Rafah in the southern Gaza Strip on Sunday. AFP

Despite the Israeli offensive, Palestinians have continued firing rockets into Israel, with the constant sirens in southern Israel a reminder of the threat.

The Palestinian death toll in Gaza rose Saturday to just over 7,700 people since the war began, with 377 deaths reported since late Friday, according to the Gaza Health Ministry. Most of those killed have been women and minors, the ministry said.

An estimated 1,700 people remain trapped beneath the rubble, according to the Health Ministry, which has said it bases its estimates on distress calls it received.

Israel says its strikes target Hamas fighters and infrastructure and that they operate among civilians, putting them in danger.

More than 1.4 million people across Gaza have fled their homes, nearly half crowding into UN schools and shelters, following repeated warnings by the Israeli military that they would be in danger if they remained in northern Gaza.

Gaza's sole power plant shut down shortly after the start of the war, and Israel has allowed no fuel to enter, saying Hamas would use it for military purposes.

Hospitals are struggling to keep emergency generators running to operate incubators and other life-saving equipment, and the UN agency for Palestinian refugees is also trying to keep water pumps and bakeries running to meet essential needs.

Associated Press