The Malaysian and Australian prime ministers say they remain committed to finding flight MH370, on the first anniversary of its disappearance.
Relatives of the 239 missing passengers and crew are holding a series of remembrance ceremonies.
The Malaysian airliner was flying from Kuala Lumpur to Beijing when it vanished. No trace has ever been found.
Meanwhile, the Malaysian government has released an interim report into the disappearance of flight MH370.
The report contains masses of technical information about the missing aircraft, its maintenance record, the background of the crew, and the various air traffic control and military radar tracking records of the plane, says the BBC’s Jonathan Head.
However, he adds, it appears to offer no significant new information which might explain where the plane went, or what happened to it.
Australia’s Prime Minister, Tony Abbott, said the search would move to a different area if the current operation in the southern Indian Ocean was unsuccessful, as long as there were reasonable leads.
“We owe it to the families of the dead, we it to the travelling public to do whatever we reasonably can to resolve of this mystery,” Australian Prime Minister Paul Abbott told reporters on Sunday.
Two experienced pilots explain what they think may have happened to flight MH370
Malaysian Prime Minister Najib Razak said the search team had followed the “little evidence that exists” but remained “hopeful” that the plane would be found.
“No words can describe the pain the families of those on board are going through. The lack of answers and definitive proof – such as aircraft wreckage – has made this more difficult to bear,” he added.
Earlier on Sunday, the families of MH370 crew members held a remembrance ceremony at the house of missing in-flight supervisor Patrick Gomez.
