A US warplane shot down an Iran-made drone operated by pro-regime forces in southern Syria early today, officials said, the second such incident in less than two weeks.
The US-led coalition said in a statement that an F-15E Strike Eagle jet destroyed the Shaheed-129 drone around 12:30 am (2130 GMT) northeast of the Al-Tanaf garrison, which is close to the Jordanian border.
"It displayed hostile intent and advanced on coalition forces," the statement read.
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A US military official told AFP the drone was "on a run toward our folks to drop a munition on them," so the coalition shot the unmanned aircraft down in self defence.
Al-Tanaf, on the key highway connecting Damascus with Baghdad, has been menaced by a surge of Iran-backed troops loyal to Syrian President Bashar al-Assad.
Coalition forces use the area - just northeast of the Jordanian border - as a training and staging area for attacks against IS.
The incident has similar hallmarks to a June 8 shoot- down, when a US F-15 destroyed a pro-regime drone after it dropped what turned out to be a dud bomb near US-backed local forces.
It also comes after an American F/A-18E Super Hornet fighter jet shot down a Syrian SU-22 fighter-bomber Sunday in northern Syria as it "dropped bombs" near the Syrian Democratic Forces, a US-backed alliance fighting IS.
"Hostile intent and actions of pro-regime forces toward coalition and partner forces in Syria conducting legitimate counter-ISIS operations will not be tolerated," the coalition statement read.
The downing of the regime jet led Moscow to say it would sever a vital hotline it uses to communicate with the US coalition to avoid mishaps in Syria's increasingly crowded and complicated battlespace.
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