The police officials are reportedly treating the incident as an act of terrorism. The police personnel have cordoned off the area.
The injured were rushed to the hospital for medical assistance.
There was a heavy police presence in the area at the time of the blast as a session of the Balochistan Assembly attended by almost all its members had then concluded.
Earlier today, Balochistan Chief Minister Sanaullah Zehri had resigned prior to a no-confidence motion being taken up against him in the provincial assembly. (ANI)