Australian Prime Minister Tony Abbott on Thursday described the search for Malaysian Airlines Flight 370 as "the most difficult in human history" and warned there was no guarantee the missing plane would be found.
"We cannot be certain of ultimate success in the search for MH370," he said at a news briefing in Perth, the western Australian city that is serving as the hub for search operations. "But we can be certain that we will spare no effort - that we will not rest - until we have done everything we humanly can."
Abbott was speaking during a visit to Perth by Malaysian Prime Minister Najib Razak, who met with members of the search teams who have been scouring a remote part of the southern Indian Ocean for traces of the jetliner.
"They told me of the difficulties of a search like this, of distance and weather and of maintaining morale over a long period," Najib said.
His visit came on the 27th day of the hunt for the passenger jet, which disappeared March 8 over Southeast Asia with 239 people on board.
Investigators are yet to provide an explanation of why the plane flew way off course or pinpoint exactly where it ended up. Officials say that an analysis of the available data suggests the jet's journey finished in the southern Indian Ocean.
But is that the right area?
Aviation journalist Jeff Wise raised his doubts with Chris Cuomo on "New Day" Thursday.
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