LIVE PRESS CONFERENCE UPDATE: OBJECTS ARE "CREDIBLE SIGHTINGS"
The objects seen on satellite radar are "possible indications of debris" about 2500km south west of Perth, south of the search area.
A RAAF aircraft arrived at the area just before 2pm (AEDT) and three more military aircraft, including two from the United States and New Zealand, are expected to reach the area later.
The US Poseidon - 8 aircraft should be on scene now.
A merchant ship that responded to a shipping broadcast issued by Rescue Coordination Australia is expected to arrive in the area about 6pm (AEDT).
The NZ aircraft should be on scene at 8pm.
Weather conditions are moderate, but poor visibility has been reported and will hamper the search.
The objects may be difficult to locate and may not be linked to the search.
They are "indistinct" on satellite imagery.
"They are of reasonable size".
The satellite images were captured in the vicinity of the search area as defined by the search in past two days.
"The imagery was assessed by experts this morning who deemed it to be "credible".
One of the objects is up to 24 metres in length, John Young, General Manager from the Australian Maritime Safety Authority said today.
"The indication to me is of objects that are of reasonable size and awash with water, bobbing up and down on the surface."
Mr Young said the objects were much larger than a basketball.
"The largest image I've seen is assessed as being about 24m," he said.
"And a number of other images in the general area."
HERE IS THE PRESS RELEASE FROM AMSA TODAY: