| http://www.w3.org/ns/prov#value | - Kuala Lumpur - Malaysia is investigating whether any passengers or crew aboard a missing airliner had personal or psychological problems that might explain its disappearance, along with the possibility of a hijack, sabotage or mechanical failure, police said on Tuesday.A massive search operation for the Malaysia Airlines Boeing 777-200ER is in its fourth day, with no trace yet of the aircraft or t
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