The Malaysian police have cleared the 227 passengers on board the missing Malaysian Airline plane of suspicion of hijacking.
However, the police is still investigation the lane's crew, including pilots.
According to he Sydney Morning Herald, Malaysia's top police officer, Khalid Abu Bakar, admitted that investigators may never discover what caused the plane's disappearance.
As the relatives of passengers accused Malaysian authorities of withholding information, Inspector-General Khalid said releasing some details could jeopardize the largest and most complex investigation undertaken in Malaysia.
The police is investigating possibilities of hijacking, sabotage or psychological problems among passengers or crew.
FBI forensic experts are still examining a flight simulator that was seized from the home of senior pilot Zaharie Ahmad Shah, 53, but have so far not found anything suspicious, the report added.
