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.

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. Hamas has yet to respond to the allegations.

The attack on a controversial aid group highlights the challenge for the U.S. and Israel to remake Gaza without Hamas