The United States, France and Britain led international criticism Tuesday of a deadly strike in the Gaza Strip that killed seven aid workers as they unloaded desperately needed food brought by sea to the war-torn territory.

US Secretary of State Antony Blinken said Washington had urged Israel to conduct a prompt and thorough probe of how an airstrike hit workers from a US-based charity group in the Gaza Strip, killing seven of them.

Israel earlier admitted it had mistakenly carried out the strike that the World Central Kitchen group said killed three British and four other staffers — an Australian, a Palestinian, a Pole and a US-Canadian.

Condemnation of Israel over the incident amid its war on terror group Hamas also came from other countries, including Australia, Canada and Poland.

At a joint press conference with French Foreign Minister Stéphane Séjourné in Paris, Blinken said the US had directly urged Israel to initiate “a swift, a thorough, an impartial investigation to understand exactly what happened.”

Blinken lamented “the record number of humanitarian workers who have been killed in this particular conflict.”

“They have to be protected,” he said. “We shouldn’t have a situation where people who are simply trying to help their fellow human beings are themselves at grave risk.”

Blinken said Israel must do more “to protect innocent civilian lives,” be they Palestinians or aid workers.

Séjourné issued his “firm condemnation” of the strike, and added that “protecting humanitarian workers is a moral and legal imperative that everyone must adhere to. Nothing justifies such a tragedy.”

Earlier, US National Security Council spokesperson Adrienne Watson wrote on X, formerly Twitter, that Washington, Israel’s main ally, was “heartbroken and deeply troubled by the strike.”

British Foreign Secretary David Cameron — who has been increasingly critical of Israel’s war in Gaza — said he spoke with his Israeli counterpart Israel Katz to underline that aid worker deaths are “completely unacceptable.”

Cameron said the UK had “called on Israel to immediately investigate and provide a full, transparent explanation of what happened.” London’s Foreign Ministry said it summoned Israel’s ambassador over the incident.

“I set out the Government’s unequivocal condemnation of the appalling killing of seven World Central Kitchen aid workers, including three British Nationals,” Britain’s Minister for Development and Africa, Andrew Mitchell, said.

“I requested a quick and transparent investigation, shared with the international community, and full accountability.”

UK Prime Minister Rishi Sunak said he was “shocked and saddened” after learning that a Briton was among those killed.

Australian Prime Minister Anthony Albanese slammed the “completely unacceptable” attack, and called it a “tragedy that should never have occurred.”

He offered “sincere condolences” to the family of Australian volunteer Lalzawmi “Zomi” Frankcom, who was killed in the strike.

“She just wanted to help out through this charity. That says everything about the character of this young woman,” Albanese said.

Canada’s Foreign Minister Melanie Joly said she was calling for a full investigation.

“Canada expects full accountability for these killings and we will convey this to the Israeli government directly. Strikes on humanitarian personnel are absolutely unacceptable,” Joly said in a post on the X social media network.

Polish Foreign Minister Radoslaw Sikorski said the country had also opened its own inquiry into the aid worker’s death.

Warsaw said it had asked the Israeli ambassador for “urgent explanations” about the incident, which killed one Polish citizen and offered “condolences to the family of our brave volunteer.”

Spanish Prime Minister Pedro Sanchez, who Tuesday was visiting a Palestinian refugee camp in Jordan, said “I expect and demand that the Israeli government clarify as soon as possible the circumstances of this brutal attack that has taken the lives of seven aid workers who were doing nothing but helping.”

The aid workers’ deaths was “the inevitable result of the way this war is currently being conducted,” United Nations spokesperson Stephane Dujarric said, and added that the UN again called for an immediate humanitarian ceasefire in the war between Israel and Hamas.

The European Union’s foreign policy chief Josep Borrell, who is also Spanish, said that “despite all the demands to protect civilians and humanitarian workers, we see new innocent casualties.”

“I condemn the attack and urge an investigation,” he wrote on X.

Criticism also came from Beijing, which said it was “shocked” by the strike.

As international condemnation swelled, Defense Minister Yoav Gallant instructed Israeli officials to “brief international organizations and partners” on Israel’s position on the “tragic” strike.

The instruction came after Gallant held an assessment with IDF Chief of Staff Lt. Gen. Herzi Halevi and other senior military officials on the incident, his office said.

“Gallant referred to the tragic nature of the incident and emphasized the importance of conducting a thorough, professional investigation, which will be followed by the implementation of lessons learned,” according to a Defense Ministry statement.

Prime Minister Benjamin Netanyahu said the strike was “unintentional.” The Israel Defense Forces has vowed to hold an investigation and promised to “share our findings transparently.”

The founder and leader of World Central Kitchen, Spanish-born US-based celebrity chef Jose Andres, said he was “heartbroken and grieving for their families and friends and our whole WCK family.”

“The Israeli government needs to stop this indiscriminate killing,” he wrote on social media. “It needs to stop restricting humanitarian aid, stop killing civilians and aid workers, and stop using food as a weapon.”

The charity said it had coordinated its movements with the Israeli army and was traveling in vehicles branded with its logo.

It has paused its operations in Gaza. Israel hopes that the World Central Kitchen will return to the Gaza Strip to continue its humanitarian work, an Israeli official told The Times of Israel.

There is not currently a plan in place in the event World Central Kitchen does not come back after the deadly strike on its convoy, the official noted.

The United Arab Emirates is also pausing humanitarian aid efforts through the maritime corridor pending further safety guarantees and a full investigation, a UAE official told Reuters.

War erupted on October 7 when Palestinian terror group Hamas led a massive cross-border attack on Israel that killed 1,200 people, mostly civilians, and took a further 253 hostages.

Israel responded with a military offensive to destroy Hamas, topple its Gaza regime, and free the hostages of whom 130 remain in captivity, some of them dead.

Negotiations via international mediators — including the US — for even a temporary ceasefire have failed to produce an agreement though talks continue. A negotiated week-long lull in November saw the release of 105 hostages, mostly women and children, in return for Israel setting free 240 Palestinian security prisoners it had jailed, and increasing humanitarian aid to Gaza.

At the Paris press conference, Blinken said both the US and Israel “agree on the need to get to the quickest possible ceasefire, to allow the release of hostages, to enable the surge and sustainment of humanitarian assistance.”

In response to a question on continued US weapons supplies to Israel, Blinken defended the policy saying they go to defense, deterrence and replenishment against threats beyond Hamas, including Lebanon’s Hezbollah terror group and its sponsor, Iran.

Séjourné, in his remarks, also called for all hostages to be released immediately and without conditions, that all civilians must be protected, and that massive humanitarian aid must be delivered.

Founded in the wake of the 2010 Haiti earthquake, World Central Kitchen is one of the largest charities working in Gaza. An apolitical group, it has earned the appreciation of Israel’s government for its help with Israelis displaced after October 7. It has been a trailblazer in transferring aid into Gaza, going so far as to construct an improvised pier out of debris on which to land supplies for the embattled enclave.

Israel has faced intense international pressure to ensure more aid gets into the Strip, especially hard-to-reach areas of northern Gaza, amid repeated warnings that the population faces starvation and famine.