In Naberezhnie Chelny 16-year old school girl died during physical training this Saturday. Incident took place in gymnasium N76 at lesson of sport combat. 16-year old Elena Elizarova, by words of head trainer Fail Shariffulin, fell down to the floor during ball game in sport gym. Her girlfriends tried to help her. "Emergency" service diagnosed sudden heart arrest. Office of Public Prosecutor investigates causes of teenager`s death. Medical examination is being made. By words of victim`s elder brother Alexander Elizarov, Elena often complained on headaches but she was not on any medical registration. By words of the city hospital department head Ivan Vahrushev, "Elizarova got medical certificate for sport section attendance which stated that she was healthy".