Suicide bombers and gunmen attacked Iran's parliament and the mausoleum of Khomeini in Tehran on Wednesday morning, killing at least 12 people in a twin assault at the heart of the republic, Iranian officials and media said. Daesh (the so-called IS) claimed responsibility and released a video purporting to show gunmen inside the parliament building and one man, who appeared wounded, on the floor. Attackers dressed as women burst through parliament's main entrance in central Tehran, deputy interior minister Mohammad Hossein Zolfaghari said, according to the semi-official Tasnim news agency. "One of them was shot dead and another one detonated his suicide vest," he said. About five hours after the first reports, Iranian news agencies said four people who had attacked parliament were dead and the incident was over. At least 12 people were killed by the attackers, the head of Iran's emergency department, Pir-Hossein Kolivand, was quoted as saying by state broadcaster IRIB. "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. Soon after the assault on parliament, another bomber detonated a suicide vest near the tomb of Khomeini, a few kilometers south of the city, Zolfaghari said, according to Tasnim. A second attacker was shot dead, he said. The Intelligence Ministry said security forces had arrested another "terrorist team" planning a third attack, without giving further details. The Intelligence Ministry called on people to be vigilant and report any suspicious movement. Despite unconfirmed reports of a hostage situation, state television said parliament had resumed, and broadcast footage of what it said was the opening session proceeding normally. — Reuters