Iran's Revolutionary Guard announced Sunday that it has launched missiles into eastern Syria, targeting Islamic State militants in response to the June 7 attacks on Tehran.
Iran warned that it would retaliate against any other groups that carry out attacks within the country.
These are the first ground-to-ground medium range missiles Iran has fired into Syria since the country entered into a civil war in 2011, according to CNN.
There was no immediate information regarding the number of casualties from the strikes, launched from Iran's Kurdistan and Kermanshah provinces.
Many took to social media to post footage allegedly showing the missiles being launched toward their intended targets.
Iran's Revolutionary Guard issued a statement on its website saying many "terrorists" were killed in the strike. The Deir el-Zour region of eastern Syria is home to both Islamic State militants and civilians.
This is one of the videos that allegedly shows missiles launching from Kermanshah.
The June 7 attack on Iran's parliament and a shrine to revolutionary leader Ayatollah Ruhollah Khomeini, which prompted Sunday's retaliation, left 17 dead and more than 50 wounded.
After the attack, Iran's Revolutionary Guard vowed to seek revenge and accused Saudi Arabia of providing support for ISIS in the operation.
The Associated Press contributed to this report.