Acoustic pings at heart of MH370 hunt not likely from black box: US official

Sydney: Four acoustic transmissions that have been the focus of the search for missing Malaysia Airlines Flight 370 are no longer believed to have come from the plane`s black box, a US official said on Thursday.
The US Navy`s deputy director of ocean engineering Michael Dean told CNN there was now broad agreement that they came from some other man-made source unrelated to the jet that disappeared on March 8 carrying 239 people.