The Islamic Revolution Guards Corps announced on Wednesday it has arrested a member of Daesh and foiled a plan for suicide attacks.
Col. Amin Yamini, the Guards commander for the western Tehran suburb of Shahriar, did not say when the arrest was made but said the attacks were being planned for a 10-day Shi'ite religious holiday that begins next week.
"So far, very important information has been collected from the Daesh element's phone, and he remains under investigation", he said.
According to the IRGC commander, the Ajnad al-Sham intends to conduct 300 terror operations in Tehran during the holy Muslim month of Muharram.
The IS terror group, which has been seeking to establish a caliphate in the region, sees Iran as one of its enemies in the region.
IS claimed responsibility for attacks in Tehran that killed 17 people at the parliament and the mausoleum of Ayatollah Ruhollah Khomeini in June.
The Revolutionary Guards fired several missiles at Islamic State bases in Syria on June 18 in response to that attack.