A Mi-17 chopper of the Indian Air Force today crashed near Tawang in Arunachal Pradesh, killing five personnel on board and leaving another seriously injured. <br/><br/>A senior IAF official said five personnel on board were killed while one person received serious injuries. He said the crash of the Mi-17 V5 took place at around 6 am when it was on a maintenance mission.<br/><br/>A Court of Inquiry has been ordered to ascertain the cause of the accident. Meanwhile, rescue teams have reached the crash site in Tawang near the Indo-China border and admitted the injured personnel to a local hospital.