Hours before the IRGC released its statement, Iran's Supreme Leader Ayatollah Ali Khamenei said "everyone should know" that Iran's enemies "cannot slap us, we will slap them in the face", according to his official website.
Iran's Revolutionary Guard Corps issued a statement, saying that it launched surface-to-surface medium-range missiles into Syria's northeastern Deir el-Zour province where Daesh terrorists have a presence. Social media was awash with shaky mobile phone footage from those areas, allegedly showing the missiles rise in an orange glow before heading toward their targets.
The Shiite-majority country is a key ally of embattled Syrian President Bashar al-Assad.
Iran claimed many terrorists had been killed in the strike, though there was no confirmation of casualties. They reported a large number of ISIS killed in the missile strikes, but exact figures are still unclear.More news: Anger erupts in London as Grenfell protesters take to the streets
It said the attack targeted "a command base. of the terrorists in Deir Ezzor", Syria's oil-rich eastern province.
The Guard warned Islamic State militants and their "regional and worldwide supporters" that similar retaliatory attacks would target them as well if another assault in Iran occurs. Iran identifies Islamic State militants as "Takfiri terrorists".
Senior Iranian officials had also put the blame for the Tehran attacks on Riyadh, saying Saudi Arabia was "promoting terrorist groups" in Iran.