Multiple aid workers were killed after a bus was attacked in Gaza on Wednesday night, according to a US-backed humanitarian aid organization which accused Hamas of carrying out the assault.

The group, which has been harshly criticized by the U.N. and other aid providers, said at least five people had died in an attack on one of its buses.

The Gaza Humanitarian Foundation, the United States and Israel-backed organisation established to supplant the aid work of the United Nations, has accused Hamas of killing five staff and wounding multiple others in an attack on a bus en route to a food distribution centre.