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A member of the media films a Royal Australian Air Force (RAAF) AP-3C Orion plane arriving at the RAAF Base Pearce in Perth, after flying over the southern Indian Ocean searching for the missing Malaysia Airlines Flight MH370 March 24, 2014.[Photo/Agencies]

There was no sign the move was linked to any breakthrough in the mystery of the plane, but rather as a preparation.

"The time for the battery life (of the 'pinger') is potentially only a month," said Jason Middleton, aviation professor at the University of New South Wales in Sydney. "If debris was found, it would be terrible not have anything on site and waste time" getting a ping detector to the region. "I think they're planning ahead and getting it ready."

Bad weather was threatening the search efforts in the area, about 2,500 kilometers (1,550 miles) southwest of Perth. Australia's Bureau of Meteorology reported increased winds, low cloud and a reduction in visibility. On Tuesday, a cold front was expected to move through the search area from the west, bringing showers, more low cloud and less visibility. Tropical Cyclone Gillian, which is further to the north, will not impact the area.

The search was given added momentum when a French satellite detected potential debris on Sunday, after Australia and China earlier released satellite images identifying suspect objects.

Australian Transport Minister Warren Truss said the French radar data located the objects about 850 kilometers (520 miles) north of the current search area, and that "we need to check that out as well."

Australian authorities had sent planes and a ship to try to locate a wooden pallet that was spotted on Saturday from a search plane, but the spotters were unable to take photos of it.

Wooden pallets are most commonly used by ships but are also used in airplane cargo holds, and an official with Malaysia Airlines said Sunday night that the flight was, in fact, carrying wooden pallets. The official spoke on condition of anonymity in keeping with company policy.

The southern Indian Ocean is thought to be a potential area to find the jet because Malaysian authorities have said pings sent by the Boeing 777-200 for several hours after it disappeared indicated that the plane ended up in one of two huge arcs: a northern corridor stretching from Malaysia to Central Asia, or a southern corridor that stretches toward Antarctica.

Malaysian authorities have not ruled out any possible explanation for what happened to the jet, but have said the evidence so far suggests it was deliberately turned back across Malaysia to the Strait of Malacca, with its communications systems disabled. They are unsure what happened next.

Authorities are considering the possibilities of hijacking, sabotage, terrorism or issues related to the mental health of the pilots or someone else on board.

Malaysia's police chief, Inspector General Khalid Abu Bakar reiterated at a news conference Monday that all the passengers had been cleared of suspicion.

But he said that the pilots and crew were still being investigated. He would not comment on whether investigators had recovered the files that were deleted a month earlier from the home flight simulator of the chief pilot.

In the U.S., Tony Blinken, President Barack Obama's deputy national security adviser, said on CNN: "There is no prevailing theory."

"Publicly or privately, we don't know," he said. "We're chasing down every theory."