HONG KONG — One of the greatest aviation mysteries of all time deepened on Monday when the official government inquiry into the disappearance of Malaysia Airlines Flight 370 released a 495-page report that gave no definitive answers as to the fate of the airliner.

The plane was heading north from Kuala Lumpur, Malaysia, to Beijing on March 8, 2014, when it deviated from its scheduled path, turning west across the Malay Peninsula. It is believed to have turned south after radar contact was lost and crashed somewhere in the southern Indian Ocean after running out of fuel.

No significant pieces of the wreckage of the jetliner, a Boeing 777, have ever been found. Nor have any remains of the 239 people on board.

The absence of definitive answers in the report, which was released at a news conference, devastated families of the victims, who have waited more than four years for the searches and investigations to be concluded.