Australian search planes have been diverted to find two objects in the southern Indian Ocean "possibly related" to the search for the missing Malaysia Airlines plane.
Prime Minister Tony Abbott has told Parliament that "new and credible information has come to light" relating to the search, based on satellite imagery.
Abbott also warned the task of locating the objects will be extremely difficult, and it may turn out they are not related to the search.
John Young from Australian maritime Safety Authority revealed more detailed research efforts at a press conference on Thursday noon.
(bjh/soundbites/0320 Aus)
John Young says the images indicate that one of the objects measures around 24 metres in length.
Authorities could not confirm who the satellite belonged to but said they were awaiting further imagery for analysis.
Four aircraft have been reoriented to the area 2,500 kilometres south-west of Perth as a result of the information.
It would not be the first time during the search for MH370 that suspected debris was found out to be unrelated to the aircraft.
During searches in the South China Sea, two large oil slicks suspected to be from MH370 were found to be a type of oil used in ships, while a reported lifeboat was found to be a cable reel covered in seaweed.
Flight MH370 has been missing since it disappeared en route to Beijing from Malaysia on March 8.
So far, the investigation has focused on the possibility that the plane was deliberately diverted from its flight path.
The plane is thought to have travelled in either of two directions: north west into Asia or south west into the Indian Ocean.
Australia has been leading the search in the southern vector, specifically an area 3,000 kilometres south-west of Perth.