SWABI: Three persons including two policemen and a passerby were killed when unknown gunmen opened fire in Swabi area, Geo News reported Monday. According to sources, police personnel signaled a suspicious car to stop at a checkpoint in Kala Pul area of Swabi. Instead of stopping the car at the check post, the culprits opened fire on the police team that killed two cops and a passerby on the spot. Two policemen were also injured in the incident who were shifted to DHQ Hospital, Swab for treatment.