"We can now confirm that 15 people have died in the explosion today".
Army Chief General Qamar Javed Bajwa also condemned the terrorist attack saying that it was an attempt to mar Independence Day festivity in the country.
According to sources, the army chief will chair a security meeting and also pay a visit to the injured in hospitals to inquire about their health.
Eight soldiers were among 17 killed in the blast and 10 soldiers were also said to be injured.
Inter Service Public Relations (ISPR) of Pakistan Armed Forces confirmed that eight security personnel were martyred in the blast. Chinese news agency Xinhua reported that two cars, four rickshaws and two motorbikes caught fire in the explosion.
Balochistan's home minister Mir Sarfaraz Bugti told media that a truck of the Frontier Corps was targeted in the blast.
Security forces reached the scene and cordoned off the area.
Latest attack on Pakistan Army by terrorists took just two days before Pakistan is going to celebrate its 70th Independence Day.
However, no group including Pakistani Taliban has claimed responsibility for the blast.
Quetta is the capital city of the restive Balochistan province.
The injured people have been shifted to a nearby hospital where a state of emergency has been declared.
The nature of the explosion could not be immediately ascertained; however, eyewitnesses said that the explosion had occurred near a security forces vehicle.
The local affiliate has been known to work with Pakistani militant groups in previous attacks.
Balochistan, which borders Iran and Afghanistan, has oil and gas resources but is afflicted by Islamist militancy, sectarian violence between Sunni and Shiite Muslims and a separatist insurgency.