Australian Prime Minister Tony Abbott calls the sighting of a number of small objects floating in the Indian Ocean "credible leads" into finding the missing Malaysia Airlines jet.
A civil aircraft reported seeing several objects, including a wooden pallet, floating about 2,500 kilometers off Perth Saturday. But a New Zealand military plane diverted to the location found only seaweed.
Mr. Abbott added there is increasing hope into discovering what happened to Flight 370.
China released satellite images taken several days ago of another large object floating in the southern Indian Ocean off Australia.
Australian images shot last week showed two large objects also in the water.
But investigators have yet to find the debris which may or may not be from Flight 370.
The Boeing 777 with 239 people on board disappeared two weeks ago while traveling from Kuala Lumpur to Beijing. There has been no firm evidence so far of what happened to the jet.
Investigators are not ruling out anything, including catastrophic mechanical failure and terrorism. They say it is possible someone with knowledge of planes diverted it far off course.
Twenty-six nations have been hunting for the plane across an area covering more than 7 million square kilometers, from Kazakhstan to the southern Indian Ocean.