Civil Hospital Quetta Spokesperson Wasim Baig confirmed seven casualties and said that injured had been brought to the medical facility where emergency has been imposed, the report said.
He added: "These cowardly attacks will not hinder our security forces in executing their duties".
"We are at war and our security forces are being targeted as they are crushing the enemies", Bugti said. At least 12, including nine policemen, were also injured in the attack, according to police sources.
"We have been fighting this war against terrorism and will keep on doing so til death of last terrorist", he said.
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The truck was carrying police recruits, five of whom were martyred, along with two passers-by on the city's eastern outskirts, Quetta Police Chief Abdur Razzaq Cheema said.
Baluchistan's Home Minister Mir Sarfaraz Bugti said six policemen had been killed in the terror attack in which the truck carrying policemen was the target.
Police and FC troops have reached the area, which has been cordoned off for gathering evidence.
The Pakistani Taliban claimed responsibility for the vehicle bombing, which took place in the Saryab Road area of Quetta, the provincial capital of Baluchistan. The bombing occurred in the city's New Saryab area on Quetta-Sibbi Road at around 8:30am. In August this year, a massive suicide explosion, targeting Pakistan Army personnel in Quetta, killed 15 people, including seven civilians.