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A view of oil slicks spotted in an area of the South China Sea about 100 nautical miles from Tok Bali Beach in Malaysia's Kelantan state

A view of oil slicks (pale line near the bottom right) spotted in an area of the South China Sea about 100 nautical miles (185 km) from Tok Bali Beach in Malaysia's Kelantan state March 9, 2014. The Malaysian Maritime Enforcement Agency said it is investigating the oil slicks to determine if they could have come from a missing Malaysia Airlines plane. The missing Malaysia Airlines jetliner may have turned back from its scheduled route before vanishing from radar screens, military officers said on Sunday, deepening the mystery surrounding the fate of the plane and the 239 people aboard. REUTERS/Malaysian Maritime Enforcement Agency/Handout via Reuters (TRANSPORT DISASTER) ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. NO SALES. NO ARCHIVES. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS

Missing Malaysia Airlines jet

The search for the missing Malaysia Airlines jet entered a new stage Friday when navy ships deployed stingray-shaped sound locators in a remote stretch of the Indian Ocean, in an increasingly urgent hunt for the plane's data recorders before their 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.

An arduous weeks-long hunt has not turned up a single piece of wreckage that could have led the searchers to the plane and eventually to its black boxes, which contain key information about the flight. The current underwater search could be completed within a week, Australian search officials said on Saturday. (AP)