He said that the explosion happened in a town where a vast population of Hazara community of Shia Muslims is settled.
Local media quoted unidentified police sources as saying that an estimated over 100 kg of explosive materials were used in the blast.
Following the blast, angry Shia protestors cordoned off the area and did not allow police, rescue teams and media to reach the blast site.
The protestors said that Hazara community was targeted dozens of times in Quetta over the last two years in which hundreds of innocent Shia Muslims lost their lives, but the government failed to provide adequate security to them.
