On Thursday, more people called on Israel to take responsibility for its airstrike on a convoy in Gaza that killed seven aid workers at the World Central Kitchen.

U.S. President Joe Biden and Israeli Prime Minister Benjamin Netanyahu are expected to have their first phone call since the attack on Thursday.

U.S. State Department spokesman Matthew Miller told reporters on Wednesday that Israel needs to take better measures to protect humanitarian workers and civilians.

World Central Kitchen said on Thursday it was asking Australia, Britain, Canada, Poland and the United States to “conduct an independent third-party investigation into these attacks, including whether they were intentional or violated international law”.

Those killed in Monday’s attack included a Palestinian, three British citizens, a Polish citizen, an Australian and a dual Canadian-U.S. citizen.

“An independent investigation is the only way to establish the truth of the incident, ensure transparency and accountability of those responsible, and prevent further attacks on humanitarian aid workers,” World Central Kitchen said in a statement.

Australian Prime Minister Anthony Albanese told reporters on Thursday that Israel’s response was not good enough “including that it was just a product of war”.

“International humanitarian law is very clear that aid workers should be able to provide assistance and that this assistance is not threatened by the loss of life,” Albanese said.

Polish Prime Minister Donald Tusk told a news conference on Thursday that Poland wanted an explanation for what happened and compensation for the families of the victims.

The Pentagon said U.S. Defense Secretary Lloyd Austin “expressed outrage” at the Israeli attack in a phone call with his Israeli counterpart Yoav Galant on Wednesday.

“Secretary Austin stated that this tragedy heightened concerns about potential Israeli military action in Rafah, particularly the need to ensure the evacuation of Palestinian civilians and the flow of humanitarian assistance,” Pentagon Press Secretary Maj. Gen. Pat Ryder said. in a statement.

Austin also noted the need for a rapid increase in the amount of aid entering Gaza in the coming days, “especially for communities in northern Gaza that are at risk of famine,” Ryder said.

Israeli Armed Forces Commander-in-Chief Herzi Halevi called the attack a “serious mistake” which he blamed on a “misidentification” at night.

Netanyahu promised a “thorough investigation” into the “tragic case.”

According to Israeli statistics, Hamas’s attacks on Israel in October killed 1,200 people and resulted in the capture of about 250 hostages.

Israel’s counteroffensive in Gaza has killed at least 33,037 people, two-thirds of them women and children, according to the Hamas-controlled Gaza Health Ministry. The Israeli military said a third of those killed were militants.

Information for this report was provided in part by The Associated Press, Reuters and AFP.