Scores of Syrian civilians have been killed in a botched US air strike targeting suspected Islamic State militants.
Up to 85 died including eight families who were killed as they attempted to flee fighting in the Manbij area of northern Syria, which has been the focus of intense fighting as territory controlled by ISIS is carved up.
It is thought to be one of the deadliest strikes by US forces on civilians in the Syrian conflict.
The US-backed Syria Democratic Forces (SDF), made up of Kurdish and Arab fighters, launched an offensive at the end of May to seize the besieged city of Manbij – the last territory held by ISIS on Syria’s border with Turkey.
The area is a key supply route for foreign fighters seeking to join ISIS as well as the illicit sale of weapons and fuel, which are believed to go back-and-forth across the border.
The Observatory said at least 104 civilians have died from air strikes since the start of the Manbij offensive.
Amnesty International has called on the US to do more to prevent civilian deaths.
American defense officials yesterday confirmed the sale of $785 million (£596 million) in bombs to the United Arab Emirates by the US for their campaign against ISIS in Syria and Iraq.
The proposed sale includes 14,640 bombs and guidance kits, along with other munitions.