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      Australian Prime Minister confident about pings; search area narrowed

      Australian Prime Minister Tony Abbottsays "we are very confident" the signals heard are coming from Flight370's black boxes.{}

      Search crews hunting for MalaysiaAirlines Flight 370 have zeroed in on a more targeted area in the Indian Oceanin their search for the source of sounds they believe could be coming from the flight'sflight data and cockpit voice recorders.

      Abbott also says search crews aregetting into the stage where signals coming from the black boxes are startingto fade.{} The batteries are designed tolast around 30 days.{} The flight vanishedMarch 8.

      Theplane's black boxes are vital and may contain the answers to why MA flight 370 lostcommunications and disappeared.{}