US fighter jets have shot down an Iran-made Syrian drone after it came within firing range of US troops.

US forces confirmed an F-15 jet downed a pro-regime armed drone today after it "displayed hostile intent and advanced on coalition forces".

5 An F-15 Strike Eagle jet shot down a Syrian drone the US claims was threatening coalition forces (file photo) Credit: Alamy

5 The Iranian-made Shahed 129 drone was downed near At Tanf, close to the Iraq and Jordan borders Credit: Getty Images

5 It comes days after a US fighter jet F/A-18E Super Hornet, pictured, shot down a Syrian military aircraft Credit: Reuters

The drone was shot down near At Tanf, close to the Syria-Iraq border, by the F-15E Strike Eagle jet around 12.30am this morning.

The incident marks an escalation in the area, where a base manned by coalition forces has been supporting an anti-ISIS Syrian rebel group.

A US military official told AFP: "They were threatening our forces on the ground.

5 CNN reported that the drone had been shot down by US forces after coming within firing distance of US troops

"Their course was on a run toward our folks to drop a munition on them."

It comes two days after the US Navy shot down a Syrian military aircraft which had dropped bombs on American-backed fighters in northern Syria.

The move sparked tensions to escalate further between the US and Russia, with Moscow vowing to shoot down all RAF and US jets over Western Syria.

Yesterday a Russian jet came within five feet of a US reconnaissance plane, with officials reported as saying it was flying "provocatively".

The drone was reportedly downed just outside the de-confliction zone, according to officials.

5 The channel said the Iranian-made pro-Assad drone had been shot down in At Tanf, southern Syria

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The Russian Defence Ministry said it was suspending its interaction with America on preventing air incidents - known as de-confliction - over Syria from June 19.

Since June 2 there have reportedly been more than 35 interactions in the Baltic Sea region between US and Russian jets and warships.

Russia’s threat came after the Syrian plane was shot down on Sunday in what Moscow branded an “act of aggression” which violated international law.

The Syrian regime’s Su-22 was targeted after it ignored warnings to stop bombing US-backed fighters in Raqqa province on Sunday.

British defence chiefs insisted RAF operations against ISIS would not be halted.

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