(NEWSER) – Australian officials have sounded a fresh note of confidence in the search for Malaysia Airlines Flight 370, saying they've reacquired underwater signals following a lapse into silence. Search chief Angus Houston says an Australian navy vessel detected two sets of pings yesterday in the same area that signals were detected over the weekend, reports the Sydney Morning Herald. "I'm now optimistic that we will find the aircraft, or what is left of the aircraft, in the not too distant future—but we haven't found it yet, because this is a very challenging business," Houston told reporters.

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