The discovery of three pulses in the search for the missing Malaysia Airlines flight is being described as a 'good lead' by the Australian authorities.
But they're playing down hopes that the acoustic signals found in the Indian Ocean could be coming from its black box recorder.
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Up to a dozen planes and 13 ships are involved in today's search.
Australia's Prime Minister Tony Abbott says he's "hopeful but by no means certain" that the signals are linked to the missing airliner.
