File Photo: The Islamic Revolutionary Guard Corps (IRGC) taking part in five-days military exercises in three provinces. AFP
The two assailants shot the victim five times as he entered his home in an alleyway in the eastern part of the capital, state media said.
Reports identified the target only as a ``defender of the shrine,'' a reference to Iranians who fight against the extremist Islamic State group in Syria and Iraq within the Guard's elite Quds force that oversees operations abroad.
There was no immediate claim of responsibility for the attack.
Security forces were pursuing the suspected assailants, state TV reported, without offering further details or giving a motive for the killing.