Terrified workers flee ISIS gunmen and cower under chairs in CCTV footage taken inside Iran's parliament during twin attacks that killed 17 people.

• ISIS killed 17 and wounded many others in the group's first attack on Iranian soil
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• Stormed parliament complex and the mausoleum of leader Ayatollah Khomeini
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• Footage showed people running for cover as gunmen strode through parliament
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• More suspects were arrested today, on top of the six Iranians held on Wednesday

This is the terrifying moment an ISIS gunman stormed Iran's parliament building in an attack with left 17 dead and several others wounded.

CCTV footage showed people running and seeking cover as the gunmen strode through parliament's halls, firing their weapons and hitting at least one person.

Attackers also raided the mausoleum of revolutionary leader Ayatollah Khomeini in what was the terror group's first ever strike at the heart of the Islamic Republic. 

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Shocking footage of ISIS terrorists storming Iran's Parliament

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This is the terrifying moment an ISIS gunman stormed Iran's parliament building in an attack with left 17 dead

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CCTV footage showed people running and seeking cover as the gunmen strode through parliament's halls

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Attackers also raided the mausoleum of revolutionary leader Ayatollah Khomeini in what was the terror group's first ever strike in Iran