US-led airstrike kills 18 ‘friendly fighters’ in Syria mistaking them for ISIS fanatics after the victims gave allied forces the ‘wrong coordinates’

The US-led coalition has killed 18 ‘friendly fighters’ in Syria after mistaking them for ISIS fanatics, it has emerged.

An airstrike accidentally targeted a Syrian Democratic Forces (SDF) unit which was battling the terror group south of Tabqa, which is near the strategically important Euphrates River.

It is not clear which air force was behind the April 11 strike, which hit advancing allied fighters not far from the Tabqa dam and military airport close to the ISIS stronghold of Raqqa.

It is understood the victims were killed after giving the wrong coordinates to the US.