The US has also said that fuel has reached Gaza - following Israel's announcement on Sunday that it would allow supplies to support non-governmental organisations (NGOs).

"We are now tracking that six trucks have crossed into Gaza with approximately 18,000 gallons of fuel - that will help support food distribution and help generators for the hospital so that they can keep working," White House national security spokesman John Kirby said.

The International Rescue Committee (IRC) earlier said that aid reaching Gaza was not enough - and that while the conflict persisted, staff were unable to do their humanitarian work.

"The scale of suffering therefore requires a massive and sustained humanitarian assistance effort, and civilians must have protection that is gravely absent - this demands an end to the fighting," a statement from the organisation said on Monday.