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.

Health officials say at least eight Palestinians were killed and dozens more were wounded in the latest shooting near Israeli- and U.S.-supported food distribution points in Gaza.

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.