Iranian security forces have killed the mastermind behind the June 7 twin attacks in Tehran which claimed the lives of 17 people, the media reported on Sunday.
The Islamic State group claimed responsibility for dual attacks Wednesday on Iran's parliament and the shrine of Ayatollah Ruhollah Khomeini.
Several safe houses of Wahhabi terrorists were identified and attacked in a joint operation by the Intelligence Ministry, the Islamic Revolution Guards Corps (IRGC), and Iran's Police, says the communiqué released on Friday at noon by Iran's intelligence ministry.
Alavi said the operation was carried out by security forces on Saturday in collaboration with the secret services of neighbouring countries, reports Efe news.
Alavi also said that in the past three months, Iran has broken up 25 terrorist teams.
People in the crowds, some crying, chanted "Death to Saudi Arabia" alongside the more customary "Death to America" and slogans against Israel, as they reached out to touch coffins wrapped in flags and covered in flowers.
While ISIS claimed responsibility, Iranian officials have also suggested Saudi Arabia may have played a role - and Iran's foreign minister called the official USA response "repugnant", after President Trump ended his expression of condolences for the victims with the message that "states that sponsor terrorism risk falling victim to the evil they promote".
Tehran police said the vehicle the attackers used for both attacks was discovered on Saturday in the city center.