QUETTA (AFP) Gunmen have shot dead three Shias in a drive-by shooting in Quetta sparking protests in the city, police said Saturday. At least three Shias were killed on Saturday when two men riding a motorbike opened fire on the outskirts of Quetta. All three men died on the spot, senior police official Tariq Manzoor told AFP. Elsewhere, a man was killed in a landmine explosion in Dera Bugti town, 400 kilometres southeast of Quetta, local security officials said on Saturday. In an incident on Friday, three people including a student and two employees of Mastung cadet college were killed in a drive-by shooting. They were returning to Quetta from Mastung town, 55 kilometres south of the provincial capital, when gunmen riding a motorbike opened fire on their vehicle. Two employees of the college died on the spot while the student succumbed to injuries on the way to hospital, local police official Mohammad Alam said.