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US officials helping with the search for Flight MH370 are "shifting focus" to the "Indian Ocean region," the BBC reported.

However, one official told the BBC that this did not necessary mean specific new leads.

White House spokesman Jay Carney said fresh lines of investigation were the reason why the scope had widened.

The plane went missing early on Saturday with 239 people on board. A search over a massive area has failed to find any clue to its disappearance.

White House spokesman Jay Carney told reporters that "because of new information, we may be part of an effort to open a new search area in the Indian Ocean,'' and that the US was consulting with the Malaysian government on what resources might be deployed.

However, officials told the BBC the intelligence was "not concrete enough to merit a rise in expectations."

The US Navy has also announced it is moving a destroyer, the USS Kidd, from its search position in the Gulf of Thailand, to the west coast of Malaysia.

Meanwhile, the Indian Navy, Air Force and coast guard are also now assisting, after a request for help from the Malaysian government.