'An armed terrorist cell, which was assigned to explode and kill innocent people in order to keep the recent unrest going, had infiltrated Iran,' the Ministry said in a statement.
The terrorists in a clash with Iranian security forces in the northwestern city of Piranshahr in west Azarbaijan, killed three forces, according to the statement.
One terrorist was also killed, and some other members of the cell were injured in the clash, said the Ministry.
During the operation, some weapons, including Kalashnikovs, grenades, military uniforms, and instructions to provoke unrest was confiscated, according to the statement.
Three other terrorist cells had previously been identified and dismantled in western Iran, the statement said.