A preliminary report regarding the helicopter crash will be released by the Air Accident Investigation Bureau within a month.

Transport Minister, Datuk Seri Liow Tiong Lai said the probe will be conducted to determine the cause of the incident.

The ministry will look into all related aspects before commenting on the safety of the route taken by the helicopter.

On the day of the tragedy, there were four to five helicopters using the same route and the other choppers landed safely.

The ministry has also called for investigators from Airbus helicopter service providers to assist the investigations.