At least two people were killed in a suicide blast in the city of Risalpur on Friday, police said.According to police, a police inspector Ajmir Shah and his driver Shakeel were killed on the spot when their security vehicle was hit by a suicide bomber. Security personnel cordoned off the area after the blast and started investigation. Four others also injured in the incident and were shifted to the Dictrict Headquarter Hospital. Risalpur city is home to the Pakistan Air Force Academy, the Military College of Engineering, the Pakistan Army Engineers Centre and the Military Engineering Services School.