An earlier Al-Masdar News report has said that hundreds of US troops have entered Syria. This number can now be confirmed to be around 400 US Marines have illegally arrived in northern Syria to participate in an offensive aimed at retaking Raqqa from the self-proclaimed Islamic State (IS; formerly ISIS/ISIL).
Dozens of US military vehicles were filmed near the US base in Manbij on Thursday.
According to the US coalition command centre, the Marines will assist the Kurdish-led Syrian Democratic Forces (SDF) in their push to re-establish control over Raqqa.
This would make it the first time since the beginning of the Syrian conflict that this formation has been deployed in action.