IS has taken responsibility for the attacks, which would be the first time the Sunni-based group has attacked the predominantly Shiite country.
The group had posted a video in March warning it would, as it phrased it, "conquer and restore" Iran.
Iranian people reaction during terrorist attacks on Iranian parliament
Tehran Source: AAP/Fars News Agency, Ali Khara via AP
Twin attacks in the Iranian capital of Tehran have killed 13 people and injured at least 43 others.
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