The UN agency for Palestinian refugees says it will be forced to stop its work in Gaza unless it receives fuel today.
“Time is running out. We urgently need fuel,” says UNRWA communications director Juliette Touma.
Six Gaza hospitals have already shut down because of a lack of fuel, the World Health Organization has said.
A small number of aid trucks have entered Gaza since the weekend, but they are only a fraction of the usual flow across the border.
Israel says Hamas is hoarding fuel.