The Islamic Revolution Guards Corps (IRGC) fired six medium-range missiles which "pounded" the Takfiri group's command headquarters as well as arms and ammunition centers Sunday night, IRGC spokesman Ramezan Sharif said on Monday.
"According to reliable information, the missile operation against Daesh has been successful," he said. The attack, he said, was "only a fraction of Iran's punitive power against terrorists and other enemies."
Amir Ali Hajizadeh, commander of the IRGC's Aerospace Force, said the missiles were fired from the Iranian provinces of Kermanshah and Kurdistan and flew over Iraq before landing in Syria.
"The UAVs which had been flown from around Damascus to Dayr al-Zawr transmitted the moments of impact to us in Iran," he said, adding "the missiles precisely hit their targets."
According to Fars news agency, which is close to the IRGC, preliminary evidence showed a large number of terrorists had been killed and their weapons destroyed.
The IRGC said the attack, the first of its kind in Iran, was in response to a terrorist operation which claimed the lives of 18 Iranians in Tehran earlier this month.
"Our enemies must know that Tehran is not London and Paris. This was a small job and if they put another foot wrong, more deadly blows will come down on their heads," Hajizadeh said.