Searchers race to find jet; no new signals heard

In this April 4, 2014, photo provided by the Australian Defense Force, the Australian Defense vessel Ocean Shield tows a pinger locator in the first search for the missing flight data recorder and cockpit voice recorder in the southern Indian Ocean. Ocean Shield, which is carrying high-tech sound detectors from the U.S. Navy, was investigating a sound it picked up. (AP Photo/Australian Defense Force, Lt. Kelly Lunt) EDITORIAL USE ONLY
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