KUALA LUMPUR, Malaysia (AP) — A Malaysian investigation into the missing flight 370 has concluded that one or more people with flying experience switched off communications devices and deliberately steered the airliner off-course, a Malaysian government official involved in the investigation said Saturday.

The official called the disappearance a hijacking, though he said no motive has been established and no demands have been made known. It's not yet clear where the plane ended up, said the official, who spoke on condition of anonymity because he was not authorized to brief the media.

The official said a deliberate takeover of the plane was no longer a theory. "It is conclusive," he said, indicating that investigators were ruling out mechanical failure or pilot error in the disappearance.

He said evidence that led to the conclusion were signs that the plane's communications were switched off deliberately, data about the flight path and indications the plane was steered in a way to avoid detection by radar.

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