Twelve people were killed in twin attacks on Iran's parliament complex and the shrine of its revolutionary leader today, Iran's emergency services chief said. ISIS in a statement claimed responsibility for the attacks. Four attackers have been killed, Iranian media reported. A total of 39 people were wounded in the two attacks, and rescue operations are continuing, Iran's emergency services chief Pir Hossein Kolivand said. Security forces had arrested a "terrorist team" planning a third attack, the Iranian Intelligence Ministry said, without giving further details. The attacks would be the first assaults by the hardline Sunni Muslim group inside the Shi'ite Muslim country. A security guard and one other person were killed when four gunmen burst into Tehran's parliament complex, according to the ISNA news agency. A gardener was reported dead and several more injured when armed assailants entered the grounds of Ruhollah Khomeini mausoleum in the south of the city.