Hospitals in Gaza reported the killing of more than a dozen people, eight of them food-seekers, by Israeli fire on Saturday as Palestinians endured severe risks in their search for food amid airdrops and restrictions on overland aid delivery.

Israel’s nearly 22-month military offensive against Hamas has shattered security in the territory of some 2 million Palestinians and made it nearly impossible to safely deliver food to starving people.

At least 91 people have been killed near aid centers across the Gaza Strip since Wednesday, according to the government media office run by Hamas and local hospitals.