US Vice President Kamala Harris has called on Israel to do more to significantly increase the flow of aid into Gaza. This comes amid uncertainty over talks between Israel and Hamas on a pause in fighting and the release of hostages.

Harris described the situation in Gaza as a "humanitarian catastrophe" during a speech in the southern US state of Alabama on Sunday.

Also on Sunday, health authorities in Gaza said an Israeli attack killed and wounded multiple people.

Israel is under growing international criticism for the humanitarian situation in the area.

Uncertainty continues over whether there will be progress in the talks between the country and Hamas.

Reuters news agency previously reported the negotiations were set to be held in Cairo, Egypt, as early as Sunday.

Egyptian media outlets said delegates from Hamas, Qatar and the United States had arrived in Egypt.

But Israeli news organizations said the country has not sent a delegation to Egypt because Hamas has failed to present a list of the hostages who are still alive.

The Qatar-based Al Jazeera television said Hamas has insisted on the complete withdrawal of Israeli troops from Gaza.