At least eight Pakistani police personnel were killed and over 20 others were injured in an explosion through a police truck on Wednesday at Quetta in Balochistan.
The bomb went off as a truck carrying 35 police personnel was passing the area.
However, the nature of the blast has yet to be ascertained.
Sarfraz Bhugti, Home Minister of Balochistan, said the attack happened when a suicide bomber rammed his explosive-laden vehicle into the security forces truck in Saryab area of Quetta, killing seven people on the spot and wounding 22 others.
Rescue teams shifted the injured persons have been shifted to the Civil Hospital for treatment.
Security forces have reached the location and cordoned off the area, and a security sweep is underway, he said.
No group immediately claimed responsibility for today's attack.
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Chief Minister Sanaullah Zehri told reporters that the bomb contained 80 kilogrammes of explosive material.
In Quetta's Qambarani Road, a police inspector Abdul Salam was gunned down. "We will continue the war against these terrorists and we will defeat them".
Balochistan has experienced incidents of violence and targeted killings for over a decade.
He added, "Terrorists plan their activities from Afghanistan while India's Research and Analysis Wing (RAW) along with Afghanistan's National Directorate of Security (NDS) facilitate the terrorists carrying out their attacks in Pakistan".
Strongly condemn terror attack in Quetta causing loss of precious lives.
Pakistani leaders, including Imran Khan, and members of the civil society condemned the attack, praying for the victims. Balochistan has faced many such attacks in recent months, with security personnel in the province often being targeted in roadside explosions and suicide attacks. Earlier in June, 14 people ─ including seven policemen ─ were killed in a powerful blast in Quetta's Gulistan Road area.