Israeli airstrikes killed at least six Palestinians guarding aid trucks against looters, Hamas officials said on Friday, underlining the problems hindering supplies from reaching hungry people in Gaza following Israel’s 11-week-long blockade.

So far, an umbrella network of Palestinian aid groups said, 119 aid trucks have entered Gaza since Israel eased its blockade on Monday in the face of an international outcry. But distribution has been hampered by looting by groups of men, some of them armed, near the city of Khan Younis, the network said.

“They stole food meant for children and families suffering from severe hunger,” the network said in a statement, which also condemned Israeli airstrikes on security teams protecting the trucks.