Kurdish separatists and Islamic extremists have carried out past attacks near the borders with Iraq and Turkey.
The report quotes Hamid Reza Abolhasani, head of the justice department in the western city of Boroujerd, as saying the suspect was trained by European spy agencies, without elaborating.
Two men fired on a bank and police post in the central province of Isfahan, without causing casualties, said state television.'No information has been published on clashes or arrests in Tehran,' said reformist news agency ILNA late Friday.
Police presence in the capital also appeared to have dwindled, official media and AFP journalists said.
have been arrested and there will be firm action against them.'Tens of thousands of regime backers have marched through cities across Iran in a show of support after a brutal clampdown on protesters left at least 21 dead.
This was the scene in the southwestern Iranian city of Ahvaz Jafari said the Guards, a parallel security force directly loyal to supreme leader Ayatollah Ali Khamenei, only intervened 'in a limited way' in the provinces of Isfahan, Lorestan and Hamedan.
It comes as Iran's semi-official Tasnim news agency said a European citizen has been detained on espionage allegations after leading rioters during anti-government protests.
There have been no reports of protests in Boroujerd in recent days.
Earlier, tens of thousands of regime backers marched through cities across Iran in a show of support after a brutal clampdown on protesters.