Qolam-Ali Jafarzadeh Imenabadi said the gunmen carried two Kalashnikov and one colt firearms.
He added one of the guards is reportedly dead.
Jafarzadeh said that the attackers entered the building and after the shooting fled the corridors.
The door to the main chamber of Majlis is closed while the MPs are inside.
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Tehran, June 7, IRNA – An MP said on Wednesday that four men attacked the Majlis (the Iranian Parliament) on Wednesday morning and opened fire injuring three guards in the corridors.