Two attackers - at least one female - blew themselves up outside the shrine, according to local media.
0654 GMT: In latest development, Rapporteur of the Parliament's National Security and Foreign Policy Commission Hossein Naqavi Hosseini told Tasnim that gunfire still continues, but the security forces have the situation under control. The remaining two attackers were arrested, the Iranian Labour News Agency reported. ISIS members consider the predominantly Shiite Iranians as heretical, and consider shrines to be idolatrous.
A picture from semi-official Fars news agency shows a man lowering a young boy from a window of the parliament building onto the street as another man holding a gun watches over them from another window.
An unknown gunman has injured several people at the tomb of the founder of the Islamic Republic of Iran, Ayatollah Ruhollah Khomeini, near capital Tehran. The Sunni extremist group is at war with Iran-backed forces in Syria and Iraq. Some sources report that an armed individual detonated himself in front of a bank outside the mausoleum. The nearby metro station is closed for entry for security reasons.
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Jaish-ul Adl (Army of Justice), which Tehran accuses of links with Al-Qaeda, has carried out several armed attacks inside Iranian territory in recent years. There, four attackers, including a suicide bomber, killed a security guard and wounded four other people.
State TV later said four attackers took part in the parliament attack, and that eight people were wounded.
Gunmen and suicide bombers have attacked Iran's parliament and the shrine of its revolutionary leader, killing at least 12 people and leaving dozens more injured.
The attackers were holding a number of hostages inside the highly-fortified parliament building, Press TV reported, as Iranian officials scrambled to establish who was behind the attacks or whether they were coordinated. It did not provide further details about Wednesday's shooting.