The Iranian Revolutionary Guards, said its military launched missiles into eastern Syria yesterday, targeting ISIS militants.
Announcing the attack, the Guards insisted “many terrorists” were killed and their weapons were destroyed within the strike.
Their statement said: “The terrorists’ command centre, concentration points and logistical centres used for assembling cars for suicide attacks in Deir ez-Zour region in eastern Syria came under attack by the [Revolutionary Guards] moments ago in a move to punish the terrorists for the twin attacks on the Iranian parliament and the holy shrine of the late founder of the Islamic Republic, Imam Khomeini, on 7 June.”
The missile strikes mark the first time the Guards have launched such perilous strikes from inside Iranian territory.
The Guards are said to be ardent supporters of President Assad's regime, straining tensions between Iran and the US.
Hours after the Iranian attack against ISIS, President Trump authorised his forces to shoot down a Syrian government fighter jet.
US officials insist they shot the Syrian warplane in "self defence" because coalition-backed fighters were threatened.
Last week, Iran accused the US of supporting ISIS attacks in Tehran which left at least 18 people dead.