"The headquarters of those responsible for the terrorist crime in Ahvaz was attacked a few minutes ago east of the Euphrates by several ballistic missiles fired by the aerospace branch of the Revolutionary Guards", the Guards said on their website.
Twenty-four people were shot dead in the attack by five gunmen on a military parade in the mainly ethnic Arab city of Ahvaz in southwestern Iran on September 22.
Iranian authorities have blamed Arab separatist movement the Ahwazi Democratic Popular Front (ADPF) as the main suspect but also directed accusations at the United States, Israel and Gulf Arab monarchies for the suspected financing, recruiting and training of Sunni terrorists involved.
In this photo released on October 1, by the Iranian Revolutionary Guard, missiles are fired from city of Kermanshah in western Iran targeting the Islamic State group in Syria.
Iran's supreme leader has called out the two Arab nations by name, accusing them of being behind the September 22 attack on the parade in the Iranian city of Ahvaz, something denied by both Riyadh and Abu Dhabi. It added that seven drones were also used to bomb rebel targets during the attack, which killed a number of fighters and destroyed supplies and infrastructure used by the group.
The US military's Central Command acknowledged that Iranian forces conducted "no-notice strikes" in the area.
Iran said on Monday it struck jihadists in Syria with ballistic missiles in retaliation for a deadly attack on an Iranian military parade, warning the "real punishment" was still to come.
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Iran's Fars news agency, closely affiliated to the IRGC, identified the missiles used as Zolfaghar and Qiam variants, which have ranges of 750 km (465 miles) and 800 km (500 miles) respectively.
In this photo released on Monday, Oct. 1, 2018, by the Iranian Revolutionary Guard, missiles are fired from city of Kermanshah in western Iran targeting the Islamic State group in Syria.
The missiles, launched from western Iran, flew over Iraq and landed near the city of Boukamal in the far southeast of Syria, they reported.
Albu Kamal itself, located on the border with Iraq, is held by Syrian President Bashar al-Assad's forces and allied regional militiamen, who seized it from IS in 2007.
At least one of the missiles #Iran launched from outside the Kurdish city of Kermanshan exploded moments after it was sacked and landed in the outskirts of the city. The separatists have not been known to work with ISIS in the past.
In Monday's statement, the Guard said that based on evidence from the Ahvaz attack, the "terrorists" in eastern Syria are supported and guided by the United States in line with "satanic" plans of the White House, the Zionist regime - Iranian parlance for Israel - and a regional power, a reference to Saudi Arabia.
A statement on the Guard's website described those killed as "takfiri terrorists", a term it often uses to refer to the Islamic State.