The Guard, which is also involved in the fight against the Islamic State group in neighboring Iraq, controls Iran's missile program.
The Guards said it fired six missiles from the west of Iran into Syria's mostly IS-held Deir Ezzor province.
"Drones flying from near Damascus to Deir Ezzor transmitted (footage of) missiles hitting their targets", he said.
'The missile attack on the Daesh was an overwhelming response to the terrorist group, as well as a message saying that the worldwide community must show more determination to fight terrorism, ' said Iranian Representative Ali Reza Rahimi. "Even Hezbollah can do better", he quoted the sources as saying.
The missile attacks came a week after ISIS militants attacked the Iranian parliament and the shrine of Ayatollah Ruhollah Khomeini, the founder of the Islamic republic.
Rahimi, a member of the parliamentary committee on National Security and Foreign Policy, recalled that the IRGC had warned that those terrorist attacks in Tehran would not go unanswered.
Also, Major General Mohammad Baqeri, head of the Iranian armed forces, pledged "unforgettable lessons" to terrorists and their backers after the Tehran assault. Former IRGC commander Mohsen Rezaei, who is now secretary of the Expediency Council, tweeted, "There are bigger strikes upcoming. Harsher slap is underway". The statement also promised more retribution attacks should Iran fall victim to any more terror attacks.
Iran has described the attackers as being "long affiliated with the Wahhabi", an ultraconservative form of Sunni Islam practiced in Saudi Arabia.
Iran's ballistic missile arsenal is one of the largest and most diverse in the region. Said Sharif. "Obviously and clearly, some reactionary countries of the region, especially Saudi Arabia, had announced that they are trying to bring insecurity into Iran".
Mohammadreza Aref, the leader of the pro-reform Hope faction, praised the missile attacks on ISIS strongholds, saying it was a "response to ill-wishers of the Islamic Iran".
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