Mausoleum of Ayatollah Khomeini housing the tomb of Ruhollah Khomeini and his family Photograph: (AFP)
Iranian forces killed two suspected members of an armed group and arrested five others in the southeastern province of Sistan-Baluchestan.
"A group of seven terrorists who wanted to attack a barracks in Chabahar (in Sistan-Baluchestan province) was dismantled. Five people, including two nationals from a neighbouring country, were arrested and two others were killed. Unfortunately, an intelligence agent was also killed," official news agency IRNA quoted Intelligence Minister Mahmoud Alavi as saying.
The minister also accused Saudi Arabia of fomenting trouble by sponsoring terrorist groups in Iran.
Tensions between the two regional rivals has seen a spike after the twin attacks on parliament and the shrine of revolutionary leader Ayatollah Ruhollah Khomeini in Tehran on June 7.
Iranian Foreign Minister, Mohammad Javad Zarif, said, "We have intelligence that Saudi Arabia is actively engaged in promoting terrorist groups operating on the eastern side of Iran in Baluchistan."
Sistan-Baluchistan is the south-eastern province of Iran, sharing borders with Afghanistan and Pakistan. The province has been repeatedly attacked by Sunni militants.