Iran's official IRNA news agency says the nation's intelligence service has confiscated about 2 tons of explosives linked to planned attacks by the Islamic State group in the country's west.

Tuesday's report quotes an unnamed intelligence official as saying the explosives were to remain in Iran, scattered at 10 different locations for what IS leaders arrive ahead of the planned attacks.

No other details on the find were immediately available.

Iran occasionally announces fighting and detaining militants it accuses of IS links.

In recent months, Iran has executed or killed dozens of extremist Islamic militants in clashes in the country's western regions.

In June, Iran said it broke up one of the "biggest terrorist plots" ever on its soil by Sunni extremists planning bombings in Tehran and elsewhere.