Deputy Commissioner Khuzdar Sarmad Saleem Akram said that explosives for mining purpose were exploded at the house causing fire which engulfed nearby makeshift huts.
As a result, seven persons including three women and two children died on the spot and over 12 received critical burn wounds, he added.
The dead and injured were shifted to Civil Hospital in Naal by private and Levies' vehicles. According to doctors, condition of six injured was critical who were referred to Karachi. The others were shifted to Civil Hospital in Khuzdar.
The dead and injured were close relatives. The Deputy Commissioner directed the Levies Force to conduct investigation into the incident.