Two people were killed when a pair of helicopters from the same Malaysian pilot school collided during a training flight, authorities said Sunday.

Amateur video that has gone viral on the internet showed one helicopter falling into a wooded part of Kula Lumpur, while the other managed to land safely in a school field.

The transport ministry said both helicopters had taken off Subang Airport for a regular training session.  

"Tragically... two crew members had perished in the crash," Transport Minister Wee Ka Siong said in a statement.

He said an investigation had been launched.

Helicopter flying as a hobby is gaining popularity among affluent Malaysians.