Amnesty International wants US-led forces to be held accountable for using white phosphorus in Syria.
The human rights group has published videos which show the coalition spraying the material over two neighbourhoods in the city of al-Raqqa. White phosphorus causes horrific injuries by burning through flesh and bone.
Amnesty says at least 14 civilians were killed in one of the strikes, which could amount to a war crime.
They’re calling for an investigation into the attack.