• US Secretary of Defense Lloyd Austin has called for an investigation into the air strike that killed aid workers in Gaza
• Australian PM Anthony Albanese said Israel's explanation for aid worker deaths was 'not good enough.'

Here are the main headlines from Israel's war on Hamas on Thursday, April 4:

US Defence chief Lloyd Austin calls Israeli counterpart over strike on aid workers

US Defense Secretary Lloyd Austin on Wednesday expressed his outrage over Israel's airstrike at an aid convoy that killed seven aid workers in Gaza.

In a phone call with his Israeli counterpart Yoav Gallant, Austin urged for more concrete steps to protect aid workers and Palestinian civilians in Gaza "after repeated coordination failures" with aid organizations.

"Secretary Austin expressed his outrage at the Israeli strike on a World Central Kitchen humanitarian aid convoy that killed seven aid workers, including an American citizen," a statement from the Pentagon said.

The call between the two leaders came after an Israeli airstrike killed seven World Central Kitchen workers in Gaza this week.

Austin also urged Israel to conduct "a swift and transparent" investigation, make its findings public and hold those responsible to account.

Israel's explanation for aid workers' death 'not good enough,' Australian PM says

Condemning the attack on a convoy of aid workers, Australian Prime Minister Anthony Albanese on Thursday said Israel's explanation for the death of aid workers in Gaza was "not good enough."

The seven aid workers who died in Gaza included an Australian woman named Zomi Frankcom.

Israel's airstrike which it says was a "mistake" has drawn widespread condemnation from its allies, including the United States.

"We need to have accountability for how it has occurred, and what is not good enough is the statements that have been made, including that this is just a product of war," Albanese said during a press conference in Sydney.

Albanese appeared to be referring to Israeli Prime Minister Benjamin Netanyahu's video message in which he said that "this happens in war."

World Central Kitchen, the organization that the aid workers had been working for, said they had been coordinating their movements with the Israeli military. Founder and celebrity chef Jose Andres said the attack had targeted his workers "systematically, car by car."

In his call with Netanyahu, Albanese demanded full accountability from Israel.

"They have committed to a full and proper investigation. I want that to be transparent and I want those findings to be made public so that we find out how exactly this can occur," he said.