The U.S.-backed Gaza Humanitarian Foundation (GHF) stated late on Wednesday that Hamas “brutally attacked” a bus of Palestinians working for the aid organization while en route to one of their distribution sites.

The Gaza Humanitarian Foundation said the attack, which the BBC could not independently verify, came after days of threats from Hamas.

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.