Two near simultaneous terrorist attacks took place in the capital, Tehran, targeting the parliament building and the shrine of Ayatollah Khomeini, the leader of Iran’s Islamic Revolution. At around 10:30 local time, three gunmen reportedly dressed as women- one of who was a suicide bomber-- stormed the parliament building. The gunmen opened fire inside the building and allegedly took a small number of family members hostages. The suicide bomber detonated his explosives device in the upper floors of the building where they were being held. The other two attackers were killed following hours of firefight with security forces. Soon after, a suicide bomber blew himself up near the shrine of Ayatollah Khomeini, located few kilometers south of the city. At least 13 people were killed in the attacks and 43 wounded. The Islamic State (IS) via its Amaq news agency claimed responsibility for the attacks—the first claimed by the group in Iran--and posted pictures and videos claiming to be live footage. The Intelligence Ministry said security forces had arrested another cell planning a third attack, while the Islamic Revolutionary Guard Corps (IRGC) released a statement blaming Saudi Arabia—Iran’s regional rival- of being behind the attacks and promised to avenge the victims.