In pictures: Deadly twin terrorist attacks in capital Tehran

ISIL carried out the suicide-bomb and gun attacks that killed at least 12 people at Irans parliament and the shrine of the Ayatollah Ruhollah Khomeini, a site of political and religious importance for Irans Shiite Muslim population.
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A picture taken on June 7, 2017, shows a police helicopter flying around outside the mausoleum of Ayatollah Ruhollah Khomeini in Tehran. Gunmen and suicide bombers stormed Iran's parliament and the shrine of its revolutionary leader, killing 12 people in the first attacks in the country claimed by the ISIL group. (HASAN SHIRVANI/AFP/Getty Images)
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Members of the Iranian Revolutionary Guard secure the area outside the Iranian parliament during an attack on the complex in the capital Tehran on June 7, 2017. Gunmen and suicide bombers carried out coordinated attacks on Iran's parliament and the tomb of revolutionary founder Ruhollah Khomeini on June 7, 2017, state media reported, killing at least three people. (HOSSEIN MERSADI/AFP/Getty Images)
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Police officers walk outside Iran's parliament building following an attack by several gunmen on June 7, 2017 in Tehran, Iran. At least 12 people were killed and dozens more wounded during simultaneous gun and suicide bomb attacks in Iran's capital. A suicide bomber targeted the shrine of Ayatollah Ruhollah Khomeini while several gunmen launched an attack on the parliament building, which is now reportedly over following hours of audible gun-fire. (Getty Images)
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A picture taken on June 7, 2017 shows policemen deploying in the main hall of Iranian parliament to protect lawmakers during the attack which targeted the complex on June 7, 2017. Gunmen and suicide bombers, including at least one woman, stormed parliament and the tomb of revolutionary leader Ayatollah Ruhollah Khomeini in Tehran on Wednesday in the first attacks in Iran claimed by ISIL group. (CHAVOSH HOMAVANDI/AFP/Getty Images)
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Police officers stand outside Iran's parliament building following an attack by several gunmen on June 7, 2017 in Tehran, Iran. At least 12 people were killed and dozens more wounded during simultaneous gun and suicide bomb attacks in Iran's capital. A suicide bomber targeted the shrine of Ayatollah Ruhollah Khomeini while several gunmen launched an attack on the parliament building, which is now reportedly over following hours of audible gun-fire. (Getty Images)
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Men in military uniform stand at a window in the Iranian parliament build-ing following an attack on June 7, 2017 in Tehran, Iran. At least 12 people were killed and dozens more wounded during simultaneous gun and suicide bomb attacks in Iran's capital. A suicide bomber targeted the shrine of Ayatollah Ruhollah Khomeini while several gunmen launched an attack on the parliament building, which is now reportedly over following hours of audible gun-fire. (Getty Images)
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A picture taken on June 7, 2017 shows the scene outside Iranian parliament in the capital Tehran during an attack on the complex. Gunmen and suicide bombers carried out coordinated attacks on Iran's parliament and the tomb of revolutionary founder Ruhollah Khomeini on June 7, 2017, state media reported, killing at least three people. (ATTA KENARE/AFP/Getty Images)
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An undercover Iranian policeman (L) holds a weapon outside the Iranian parliament in the capital Tehran on June 7, 2017 during an attack on the complex. The ISIL group claimed its first attacks in Iran as gunmen and suicide bombers killed at least five people in twin assaults on parliament and the tomb of the country's revolutionary founder in Tehran. (OMID VAHABZADEH/AFP/Getty Images)
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Police officers stand outside Iran's parliament building following an attack by several gunmen on June 7, 2017 in Tehran, Iran. At least 12 people were killed and dozens more wounded during simultaneous gun and suicide bomb attacks in Iran's capital. A suicide bomber targeted the shrine of Ayatollah Ruhollah Khomeini while several gunmen launched an attack on the parliament building, which is now reportedly over following hours of audible gun-fire. (Getty Images)
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A picture taken on June 7, 2017 shows ambulances and police arriving at the scene outside Iranian parliament in the capital Tehran during an attack on the complex. Gunmen and suicide bombers carried out coordinated attacks on Iran's parliament and the tomb of revolutionary founder Ruhollah Khomeini on June 7, 2017, state media reported, killing at least three people. (ATTA KENARE/AFP/Getty Images)