Syria: Aljazeera have also reported the presence of military jets
There are multiple reports of coalition aircraft in the air over Iraq and Jordan, heading towards Syria.
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 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.
— Michael A. Horowitz (@michaelh992) 10 April 2018
“Almost everyone I know in Damascus is up and waiting for news on possible US strikes, you can cut the tension with a knife.”
A Twitter user said: “Coalition jets soaring the skies in large Deir-Ez-Zor desert.”
There are also reports that civilian aircraft have been requested to alter their routes in Syria.
Aljazeera has also reported the presence of military jets.
Eurocontrol warns airlines to exercise caution in Eastern Mediterranean due to a possible launch of air strikes into Syria in the next 72 hours.
Syria: Assad has been blamed for the alleged chemical weapons attack
The news comes after an Israeli airstrike on Syria’s Tiyas Military Airbase (T4) on Monday.
The T4 airbase is an Iranian outpost in central Syria, part of the corridor from Syria to Iraq.
President Trump said Syria’s President Assad is an “animal” and had a “big price to pay”.
Tensions have been high since an alleged chemical attack which has been blamed on the Syrian regime.
Syria: Both Russia and Syria deny any involvement in a chemical weapons attack
Medical sources say dozens of people were killed on Saturday during the suspected chemical attack on Douma, in the Eastern Ghouta region.
It has not been possible to independently verify the reports.
Both Syria and Russia deny the chemical attack took place.
French President Emmanuel Macron, US President Donald Trump and Theresa May refused to rule out military action in Syria.
They warned Russia will be “held to account” if it is proven it was authorised by the Moscow-backed Assad regime.