The area where the quake struck is at the center of an insurgency that Baluch separatists have been waging against the Pakistani government for years. The separatists regularly attack Pakistani troops and symbols of the state, such as infrastructure projects.
Baluchistan and neighboring Iran are prone to earthquakes. A magnitude 7.8 quake centered just across the border in Iran killed at least 35 people in Pakistan last April.
Sattar reported from Quetta. Associated Press writers Asif Shahzad and Rebecca Santana in Islamabad and Adil Jawad in Karachi contributed to this report.