Syria: Aljazeera have also reported the presence of military jets

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There are multiple reports of coalition aircraft in the air over Iraq and Jordan, heading towards Syria.

Also a KC-767 re-fueling aircraft has entered Jordan from Saudi Arabia, according to reports.

This type of plane provides logistics for jet fighters.

There is also news of airstrikes in the Idib Province and Russian planes in the sky - although these reports are unconfirmed so far.

Fox News has also announced "imminent action" on live TV and the Pentagon is said to be preparing to make a statement.

Geopolitical and security analyst Michael A. Horowitz said: “Russian warplanes are still in the air according to pro-opposition sources reporting airstrikes in the Idlib Province.”

A journalist on the ground said: “Heavy flight of US & coalition aircraft over the Syria - Iraq border at present.