Malaysia Airlines plane search: New possible signal detected

Fresh hope fueled the search for the missing Malaysia Airlines plane Thursday after a plane detected a possible underwater signal. The crew of an Australian P-3 Orion dropped dozens of buoys equipped with underwater sensors into the ocean, and they heard something. The signal - the fifth picked up by search teams so far -- may be from one of the so-called black boxes aboard Flight 370, the Australian agency coordinating the search announced.

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