Angus Houston, the head of a joint agency coordinating the search in the southern Indian Ocean, said on Wednesday that the Australian navy's Ocean Shield has picked up two more underwater signals that could be from Flight 370.
The Ocean Shield first detected the sounds late Saturday and early Sunday before losing them, and Houston said the ship relocated the signals twice on Tuesday.
The ship is equipped with a U.S. Navy towed pinger locator that is designed to pick up signals from a plane's black boxes.
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