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Desperate hunt is on for Flight 370 ‘black boxes’

Relatives of those onboard the missing plane cried in a prayer room in Beijing on Friday.
Relatives of those onboard the missing plane cried in a prayer room in Beijing on Friday.Ng Han Guan/Associated Press

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PERTH, Australia — Four weeks after the Malaysia Airlines jet vanished, two ships deployed sound locators Friday in the southern Indian Ocean in a desperate attempt to find the plane’s flight recorders before their signal beacons fall silent.

Officials leading the multinational search for Flight 370 said there was no specific information that led to the underwater devices being used for the first time, but that they were brought into the effort because there was nothing to lose.

The air and sea search has not turned up any wreckage from the Boeing 777 that could lead searchers to the plane and perhaps its flight data and cockpit voice recorders, or ‘‘black boxes.’’

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