UNRWA, the main U.N. agency aiding Palestinians, said its drivers were forced at gunpoint to unload supplies in what it called one of the worst such incidents of the war.

As many of Gaza's more than 2.3 million people desperately wait for humanitarian assistance and food to reach them, aid trucks are being violently ransacked before getting to their destination, say international organizations.

These groups operate in areas that are under Israeli military control. The main entry point for aid, the Kerem Abu Salem or Kerem Shalom crossing, is located in the south, in a part of Gaza that Israeli forces took over in May. It is there where most of the pillaging occurs — sometimes just hundreds of meters away from Israeli forces.