The Islamic State group has claimed attacks on Iran's parliament and the shrine of Ayatollah Ruhollah Khomeini, which killed up to seven people and wounded several others.
"Fighters from Islamic state attacked Khomeini's shrine and the Iranian parliament in Tehran," the Amaq news agency said.
In another statement the news agency said Wednesday's attacks on Khomeini's shrine were carried out by two suicide bombers.
The two attacks happened almost simultaneously and killed up to seven people.
Three assailants, one with a pistol and two with AK-47 assault rifles, carried out the parliament attack in central Tehran, politician Elias Hazrati told state television.
Another politician said one of the assailants was surrounded by security forces and all the doors to the building had been closed, ISNA news agency reported. The attackers killed seven people and wounded several others, Tasmin said.
"I was inside the parliament when shooting happened. Everyone was shocked and scared. I saw two men shooting randomly," said one journalist at the scene, who asked not to be named.
The situation at the parliament remains confusing, with some reports of a suicide bomber there, and an ongoing hostage situation.
Around half an hour later, an attacker opened fire at the Mausoleum of Ayatollah Khomeini, injuring several members of the public, Iran's English-language Press TV said.
State news agency IRNA quoted an official at the mausoleum as saying the attacker had set off a suicide bomb after shooting at people.
Ayatollah Ruhollah Khomeini launched the Islamic revolution in 1979.