Signals in remote seas thought to be from the missing Malaysia Airlines flight MH370 are “rapidly fading” and finding the jet will be a “massive, massive task”, Australia’s PM says.
Tony Abbott said he was confident “pings” detected by search teams were from the aircraft’s black boxes.
But no new signals have been confirmed in the search area since Tuesday.
“No one should underestimate the difficulties of the task still ahead of us,” Mr Abbott warned.
Correspondents say Mr Abbott appeared to be couching his comments from Friday, in which he said he was “very confident” that signals heard by an Australian search ship were from the missing Boeing 777.