A Mi-2 helicopter crashed in Kazan. Nobody was killed, but three people were injured in the accident, a source at the Russia Emergencies Ministry's department in Tatarstan told Itar-Tass. The helicopter was on a medical flight. Aboard it were two pilots and a doctor. The Mi-2 took off from the helicopter ground at the republic's central hospital and in a few minutes fell, the source said. All who were aboard survived. The two pilots and the doctor with injuries were hospitalized. An investigation is underway to establish what caused the crash.