Iran's Islamic Revolution Guards Corps on Sunday said it launched missiles into Syria targeting Islamic State militants in retaliation for the June 7 Tehran attack in which 18 people died.
The missile strikes, which occurred on Saturday, are the first reported ground-to-ground strikes from Iran into Syria since the Arab country descended into a civil war in 2011.
Iranian Revolutionary Guards launched the mid-range ground-to-ground missiles from western Iran into the Deir al Zour region of eastern Syria, killing a "large number" of terrorists and destroying their equipment and weapons, it said.
Sunday's assault marked an extremely rare direct attack from the Islamic Republic amid its support for embattled Syrian president Bashar Assad.
"The spilling of any innocent blood will not go unanswered", Press TV cited a statement by the Revolutionary Guards as saying. Social media was awash in shaky mobile phone footage from those areas, allegedly showing the missiles rise in an orange glow before heading toward their targets.
The Daesh Takfiri terrorist group claimed responsibility for the assaults.
The IRGC said the missile strikes were a warning to deter future Islamic State attacks. According to Iran, the militant groups were responsible for the twin terror attacks in Tehran about two weeks ago.