Malaysian Transport Minister Mishamuuddin Hussein has told reporters the disappearance of flight MH370 is "unprecedented".
He said: "Our focus has been on finding the aircraft and we have not done anything that would jeopardise this search effort...Malaysia has nothing to hide."
He added: "There is no precedent for this. The plane vanished."
A mother has described her frustration as she waits for answers on the fate of her missing son who is on board the missing Malaysia plane.
Malaysia's military believes a jetliner missing for almost four days turned and flew hundreds of kilometres to the west.
The wife of a passenger travelling on the missing Malaysia Airlines flight has spoken of her struggle to cope as she waits for news.