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 controversial aid organization said at least five of its Palestinian volunteer workers were killed in an attack it blamed on Hamas militants.

At least eight Palestinians who worked for the U.S-backed Gaza Humanitarian Foundation died in an ambush, the GHF said on Thursday, blaming Hamas militants for the killings that rocked the troubled food distribution operation.