During the 2017 Tehran attacks on the Islamic Consultative Assembly ( Iran 's parliament ) and the Mausoleum of Ruhollah Khomeini 18 people died ( excluding the attackers ) . The responsibility was claimed by ISIL . The Iranian Islamic Revolutionary Guard Corps ( IRGC ) subsequently vowed retaliation for the attacks . Supreme Leader of Iran seyed Ali Khamenei stated on his website that Iran would " slap its enemies " in connection with the Tehran attacks . Hours before the missile strike , Iranian Army ’s rapid response forces were deployed in the country 's western border areas
2017 Tehran attacks
2017 Tehran attacks
2017 Deir ez-Zor missile strike