Hunt for jet lacks concrete leads

Agencies expand search area, say no cause can be ruled out

Posted: March 11, 2014 at 3:52 a.m.

CEO of Malaysia Airlines Ignatius Ong, center, gestures as he prepares to speak to the media outside a hotel room for relatives or friends of passengers aboard a missing Malaysia Airlines airplane in Beijing, China Monday, March 10, 2014. Vietnamese aircraft spotted what they suspected was one of the doors of the missing Boeing 777 on Sunday, while questions emerged about how two passengers managed to board the ill-fated aircraft using stolen passports. (AP Photo/Andy Wong)

SEPANG, Malaysia — The mystery of Malaysia Airlines Flight MH370 deepened Monday when a sweeping search failed to find any sign of the jetliner near its last known location, leaving experts to puzzle over how a Boeing 777 with 239 people aboard could have vanished without a trace.

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Front Section, Pages 6 on 03/11/2014