The blast took place on Monday in the city of Quetta’s Saryab road targeted a passenger bus stationed at the terminal with some 40 passengers on board.
Rescue personnel have confirmed that two children are among the dead.
All the injured have been shifted to the hospital with six of them in critical condition.
“We suspect somebody had hid a bomb in the backside of the bus, but there are also chances that somebody was maybe carrying it,” said Akbar Hussain Durrani, home secretary of Baluchistan province.
Baluchistan’s chief minister Abdul Malik Baloch strongly condemned the bombing and termed it as “a conspiracy against durable peace in Baluchistan.”