The new group backed by Israel and the US for aid distribution in Gaza says Hamas attacked a bus transporting some of its Palestinian workers, killing at least five people.
The Gaza Humanitarian Foundation (GHF) said the attack happened on Wednesday night as the bus carrying more than two-dozen workers travelled to a distribution centre in southern Gaza, and that it came after days of threats from Hamas.
The BBC cannot independently verify the statement, and Hamas has not commented but it previously denied it had threatened the foundation's staff.
The system started operating on 26 May, to bypass the United Nations (UN) and other established organisations to distribute aid in Gaza.
Since then, its work has been marred by controversy and violence, with deadly incidents happening near its hubs almost every day.
