“Our humanitarian colleagues tell us that across Gaza, Israeli attacks continue unabated, causing systematic, large scale civilian casualties,” UN spokesperson Stephane Dujarric said at a news conference.

The people in Gaza “including many children, are being killed, injured and maimed for life,” Dujarric stated.

“Survivors across Gaza are being displaced repeatedly and forced into an ever shrinking space where their basic needs just cannot be met,” he added.

“Overall, we estimate that nearly 400,000 people have been displaced yet again since the breakdown of the ceasefire. That’s 18% of all Palestinians in Gaza.”

Dujarric also emphasized that “no arrangements to secure their safety and survival have been made — a responsibility that falls on Israel as the occupying power.”

He warned that humanitarian aid efforts are at a breaking point and said: “We cannot sustain this for much longer unless the crossings are reopened immediately for humanitarian goods and equipment that will be essential to the survival of people in Gaza.”

Citing the UN Office for the Coordination of Humanitarian Affairs (OCHA), Dujarric reported that “all attempts to pick up commodities have been brought in and dropped at the crossings have been denied,” and that “most attempts to coordinate these movements result in access being denied.”

On Israel’s killing of paramedics caught on video, Dujarric noted that UN Secretary-General Antonio Guterres is “very much aware of the video and I think, like anyone who has seen it, is just shocked by those images.”

He reiterated the UN’s call for an “independent, transparent and effective investigation to what happened.”

Regarding polio vaccines, Dujarric added: “There’s been no vaccine, no food, no fuel, no supplies have gone in at all for over a month, so and I’m not aware of any exception for polio vaccines.”

The Israeli army renewed a deadly assault on Gaza on March 18 and has since killed nearly 1,400 people, injured over 3,400 others, and shattered a January ceasefire and prisoner exchange agreement in the enclave.

Last week, Israeli Prime Minister Benjamin Netanyahu vowed to escalate attacks on Gaza as efforts are underway to implement US President Donald Trump’s plan to displace Palestinians from the enclave.

More than 50,700 Palestinians have been killed in Gaza in a brutal Israeli onslaught since October 2023, most of them women and children.

The International Criminal Court issued arrest warrants last November for Netanyahu and his former Defense Minister Yoav Gallant for war crimes and crimes against humanity in Gaza.

Israel also faces a genocide case at the International Court of Justice for its war on the enclave.

In a statement on Monday, the group said the March 23 attack in Gaza’s southern city of Rafah “constitutes a full-fledged war crime, and it reflects a dangerous pattern of repeated violation of international humanitarian law”.

PRCS President Younis al-Khatib stated an independent commission is needed “to establish the facts and hold those responsible accountable”.

Israeli forces opened fire at the medics, who were driving in ambulances to assist wounded people at the site of an earlier Israeli attack.

A video recently recovered from the mobile phone of one of the medics showed their final moments. The medics were wearing highly reflective uniforms and were inside clearly identifiable rescue vehicles before they were shot by Israeli forces in Rafah’s Tal as-Sultan neighbourhood.

According to the PRCS, the convoy came under heavy gunfire for about five minutes. It said communication between the team and the central dispatch centre “confirms that the gunfire continued for no less than two hours” with continuous shooting heard until contact was completely lost with one of the medics.

This has also been confirmed by one survivor, who said the ambulances came under direct fire with no warning, according to al-Khatib. The survivor also said he was used by Israeli officers as a “human shield” before being able to escape.

“It is no longer sufficient to speak of respecting the international law and Geneva Convention,” al-Khatib told reporters from el-Bireh in the occupied West Bank.

“It is now required from the international community and the UN Security Council to implement the necessary punishment against all who are responsible.”

Al-Khatib also called on the international community to safeguard aid workers and prevent the targeting of hospitals, medical centres and ambulances.

He also requested that Israel disclose the whereabouts of the PRCS staff who are still missing.

The PRCS lost eight of its workers in the attack. Six members of the Palestinian Civil Defence agency and an employee of the United Nations agency for Palestinian refugees, UNRWA, were also killed.

The Israeli military had claimed its soldiers “did not randomly attack” any ambulances, insisting they fired on “terrorists” approaching them in “suspicious vehicles”.

“Several uncoordinated vehicles were identified advancing suspiciously toward [Israeli army] troops without headlights or emergency signals,” it added.

But al-Khatib refuted this claim, saying the ambulances had emergency lights on.

“We at PRCS have been accustomed to Israel’s false allegations and fabricated stories with regards to what goes on in the Gaza Strip,” al-Khatib stated.

“We believe that the whole world, including media representatives, has now come to realise who is telling the truth,” he continued.

In its statement, the PRCS announced the area was not classified as a “red zone” at the time of the emergency response, which means no prior coordination was required to access the site.

It added for several days after that, Israeli troops prevented rescue teams from accessing the area under the pretext that it was a “red zone”.

Then only limited access was granted, during which PRCS teams recovered the body of a Civil Defence member before Israeli forces forced the rescue team to withdraw, it said.

On March 30, the bodies of 14 others were discovered in a “mass grave in a brutal and degrading manner that violates human dignity”, the PRCS added.

The attack was decried by the Civil Defence, Gaza’s Government Media Office, Hamas and UN High Commissioner for Human Rights Volker Turk, who said the incident raises concern over possible “war crimes” by the Israeli military.

Meanwhile, Tom Fletcher, head of the UN Office for the Coordination of Humanitarian Affairs, said that since Israel broke the ceasefire in Gaza on March 18 and resumed its war on the enclave, Israeli air attacks have hit “densely populated areas” with “patients killed in their hospital beds, ambulances shot at, first responders killed”.

According to UNRWA, at least 408 aid workers, including more than 280 UNRWA staff members, have been killed by Israeli forces in Gaza since the war began on October 7, 2023.

Gaza’s Ministry of Health said that since March 18, at least 921 people have been killed in the territory, adding to the more than 50,000 killed since the war began – most of them children and women.

The violence pushed the heads of six UN agencies to call on Monday for an immediate renewal of the ceasefire that Israel unilaterally broke and the re-entry of humanitarian aid into Gaza.