The Press TV broadcaster, meanwhile, said one of the mausoleum assailants "has reportedly killed himself by swallowing cyanide". The Tasnim news agency said that the identity and motivation of the assailant was still unclear.
Police officers run to take position around Iran's parliament building following an assault by several attackers on Wednesday.
The two civilians had reportedly come to visit their deputies in Tehran.
The semi-official ISNA news agency said all entrance and exit gates at parliament were closed and that lawmakers and reporters were ordered to remain in place inside the chamber. "Clashes still continue at the parliament building", he said.
Two of the assailants shot at visitors, while the third "detonated himself in a suicide attack", the semi-official news agency said.
"There were three attackers armed with two Kalashnikov rifles and one colt pistol", MP Elyas Hazrati was quoted as saying.
At the same time, a gun and suicide bomb attack targeted the Ayatollah Khomeini mausoleum on the southern outskirts of the Iranian capital. Later reports indicated an armed attack by several activists.
Alison translates: "Fighters from the Islamic State have attacked the Khomeini shrine and the parliament building in central Tehran".
The location of the mausoleum attack is symbolic, targeting the tomb of the Islamic Republic's founder and first supreme leader Ayatollah Ruhollah Khomeini.
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