The cause of the incident is said to be a cylinder explosion, which resulted in a collapse in a portion of the building.
At least one person was killed and 200 wounded in clashes in Iraq on Tuesday as security forces used tear gas, water cannon and live fire to disperse demonstrations over unemployment, corruption and poor public services.
Police reached the spot after the incident and arrested six persons involved in the fight.
The injured were rushed to THQ by the rescue teams.
' Two men involved in the shootout have been arrested with weapons recovered from their custody'
Police said that the bomb was planted in a motorcycle parked outside a hospital near Mazdoor Chowk in Dera Murad Jamali.
Superintendent Police Fahd said employees of a petrol pump were trying to steal Rs5 million from the filling station.