BENGALURU: A couple was killed and two others seriously injured when an ambulance lost control and collided with several motorcycles stopped at a red light in Bengaluru on Saturday night. The incident occurred near Richmond Circle at around 11:00 pm, according to local police. Eyewitnesses said the speeding ambulance struck three motorcycles, dragging one for a few metres before hitting a nearby police outpost and coming to a stop. The victims, identified as 40-year-old Ismail and his wife Sameen Banu, were riding a scooter and died at the scene.Two other riders sustained serious injuries and were taken to a nearby hospital. The ambulance driver, Ashok, has been detained by Wilson Garden traffic police for questioning.