(FNA) -- Four unidentified armed assailants started a shooting spree at Imam Khomeini's shrine this morning.

Three of the assailants shot tens of rounds at the people visiting the shrine, while the fourth one detonated himself in a suicide attack in front of a police station opposite the shrine.

Fresh dispatches by FNA from Southern Tehran said the suicide attacker was a female.

The law enforcement and guards at the shrine said they have also defused another suicide vest at the scene.

Meantime, the sound of a blast has been heard at an underground near the shrine.

Reports at 07:10 GMT said that one of the assailants has been killed in the clashes, a second one has committed suicide after swallowing a cyanide capsule, and the third one was a female and captured after clashes with the law enforcement troops.

The attack took place along with a similar incident at the parliament building.

The ISIL has taken responsibility for both attacks.