At least eight people were killed and 35 others injured in a blast targeting a security forces' vehicle in Quetta, provincial capital of Balochistan, on Saturday, Dawn reported.
A top provincial police official, Imtiaz Shah, confirmed it was a suicide attack and said the attacker blew himself up near a vehicle belonging to the Balochistan Frontier Corps.
The outlawed Tehreek-e-Taliban Pakistan has claimed responsibility for the attack in an email sent to journalists, however,the claim could not be verified.
Earlier, provincial home secretary Akbar Durrani said said: "We can not ascertain right now whether it was an Improvised Explosive Device or a suicide attack."
Television footage showed several wounded Frontier Corps personnel being shifted from the scene.
Quetta is the provincial capital of Balochistan. The province has been experiencing incident violence and targeted killings since more than a decade.
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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.