"More than 20 people have been injured, six of them critical" Javed Gharheen, a senior police official was quoted as saying.
Malik Baloch, the chief minister of Baluchistan has strongly condemned the bombing and termed it "a conspiracy against durable peace in Baluchistan."
Baluchistan has been witnessed over 1,400 incidents targeting the minority Shia and Hazara communities have taken place in the province during the past 15 years.
The largest province of the country by area, is home to a low-level insurgency by ethnic Baloch separatists. Al Qaeda-linked and sectarian militants also operate in the region.
The province shares borders with Afghanistan and Iran.