PERTH, Australia -- Rain was expected to hamper the hunt today for the missing Malaysia Airlines jet, as a growing number of planes focus on an expanded area of the south Indian Ocean where French radar detected potential debris.
Australian Maritime Safety Authority's rescue coordination center said the search area was expanded from 22,800 square miles to 26,400 square miles today, including a new separate area covered by data provided by France on Sunday.
Two Chinese Ilyushin IL-76 planes joined the search from Perth today, increasing the number of aircraft from eight on Sunday to 10, AMSA said.
It said the weather in the search area, about 1,550 miles southwest of Perth, was expected to deteriorate with rain likely.
Australian Transport Minister Warren Truss said "nothing of note" was found Sunday, which he described as a "fruitless day."
"It's going to be a challenge, but we'll stick at it," he told Australian Broadcasting Corp. radio before the first aircraft left Perth at dawn.
He said the new search area based on French radar data was 530 miles north of the previous search zone. He said it was not the same area that had been identified as the most likely place where the aircraft may have entered the sea, "but ... we've got to check out all the options."
"We're just, I guess, clutching at whatever little piece of information comes along to try and find a place where we might be able to concentrate the efforts," he added.
A cyclone bearing down on the Australian northwest coast "could stir up less favorable weather," he said.
Flight 370 vanished March 8 with 239 people aboard while en route from Kuala Lumpur, Malaysia, to Beijing, setting off a multinational search that has turned up no confirmed pieces and nothing conclusive on what happened to the jet.
The latest French satellite data came to light Sunday as Australian authorities coordinating the search sent planes and a ship to try to "re-find" a wooden pallet that appeared to be surrounded by straps of different lengths and colors.
The pallet was spotted Saturday from a search plane, but the spotters were unable to take photos of it, and a PC Orion military plane dispatched to locate it could not find it.
"So, we've gone back to that area again today to try and re-find it," said Mike Barton, chief of the Australian rescue coordination center. "It's a possible lead," he added.
Wooden pallets are often used by ships, Mr. Barton cautioned. But he said airlines also commonly use them in cargo holds.
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.
AMSA said it has requested a cargo manifest from Malaysia Airlines.
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.