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Traffic makes its way through heavy rain throughout the Jackson, Miss., area Sunday, April 6, 2014. On Sunday, street flooding plagued Jackson. Flood advisories for much of the state continued into Monday. (AP Photo/The Clarion-Ledger, Rick Guy ) NO SALES

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The chief coordinator of the Joint Agency Coordination Center retired Chief Air Marshall Angus Houston shows a map to the media during a press conference about the on going search operations for wreckage and debris of missing Malaysia Airlines Flight 370 in Perth, Australia, Monday, April 7, 2014. Houston reported the towed pinger locator deployed from the Ocean Shield has detected two signals consistent with those emitted by an in flight back box recorder, in the northern part of the current search area in the southern Indian Ocean. (AP Photo/Rob Griffith)

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A Chinese Ilyushin IL-76s aircraft taxies past a commercial jet on the tarmac at Perth International Airport after returning from search operations for wreckage and debris of the missing Malaysia Airlines Flight MH370, in Perth, Australia, Monday, April 7, 2014. Underwater sounds detected by a ship searching the southern Indian Ocean for the missing Malaysia Airlines jet are consistent with the pings from aircraft black boxes, an Australian official said Monday, dubbing it "a most promising lead" in the monthlong hunt for the vanished plane. Angus Houston, the head of a joint agency coordinating the search, warned that it could take days to confirm whether the signals picked up by the Australian navy ship Ocean Shield are indeed from the black boxes that belonged to Flight 370, but called the discovery very encouraging. (AP Photo/Rob Griffith)