SINGAPORE - He was team leader of a Citizens on Patrol (COP) group and was on duty at Teck Ghee estate, along with two other members, when a resident told them a group of teenagers were behaving suspiciously at a rooftop carpark.Mr Pragash Kulasagar and his team hurried to the scene and saw that the carpark walls had been vandalised, while potted plants, water hoses and a fire