Alexandra Saieh, a spokeswoman for Save the Children, said that Israeli attacks like that on a UNRWA school in Nuseirat make the delivery of humanitarian aid “almost impossible”.

“The number one obstacle to delivering aid right now is safety. Save the Children and other organisations rely on [the] safety of schools, of camps to be able to deliver any humanitarian assistance,” she told Al Jazeera.

“Over the course of the past nine months, we’ve seen more than 270 aid workers killed, the majority of them Palestinian. We have not seen any assurances that aid operations and aid workers will be guaranteed any sort of safety and we continue to see immense restrictions on the delivery of humanitarian assistance.

“We are continuing to see supplies obstructed from coming into the Gaza Strip,” she said. “What we need is a ceasefire. What we need is for countries to stop supplying weapons that are fuelling this crisis.”