QUETTA - Two persons were killed in separate incidents of bomb blast and target killing in Turbat and Quetta towns of Balochistan on Tuesday. According to police, a person was planting an explosive device at Overseas Colony on Airport Road of Turbat when device exploded with a big bang. Resultantly, he sustained critical wounds and died instantly. In another incident, unidentified assailants shot dead a Punjabi-speaking person in Quetta.