The arrests were made in Alborz province's Fardis town, reports Xinhua news agency.
The seven persons were affiliated to terrorist groups, the police added.
On Friday, Iran's Intelligence Ministry said since the attack on Wednesday security forces have arrested 41 individuals linked to the Islamic State (IS) in Tehran, Kermanshah, Kurdistan and West Azarbaijan provinces.
The two simultaneous attacks were carried out by IS militants in Iran's Majlis (parliament) and the mausoleum of the founder of the Islamic republic Ayatollah Khomeini.
Six attackers were killed by Iran's security forces.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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