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As the international search for missing Malaysia Airlines Flight MH370 enters a sixth day, the mystery over the plane's whereabouts has deepened.
Malaysian officials have made conflicting statements about the investigation so far, indicating a state of confusion at the highest levels over where the plane might be and adding to the anguish of passengers' family members.
It's still unclear if the cause of the plane's sudden disappearance is due to a catastrophic incident that led to rapid disintegration, mechanical failure, pilot error or terrorism. Here is everything we know so far:
Plane goes missing
Beijing-bound Flight 370, with 239 people aboard, vanished about an hour after it took off early Saturday from Kuala Lumpur International Airport. It fell off civilian radar screens at 1:30 a.m. about 35,000 feet above the Gulf of Thailand between Malaysia and southern Vietnam.
The last words radioed by the Boeing 777: "All right, good night." The flight's final transmission seems to indicate that all was normal shortly before the jet vanished. The words from someone in the cockpit were picked up by air traffic controllers early Saturday and provided to relatives of some of the passengers in Beijing on Wednesday.
Plane off course
Malaysia's air force chief Gen. Rodzali Daud said that an unidentified object appeared on military radar records hundreds of miles west of the intended flight path of MH370, raising the possibility the jet veered well off course and was flying more than an hour after it stopped communicating. On Wednesday, Daud denied telling local news media that the image was that of MH370. Aviation experts were looking over the data.
The search for the missing plane was expanded to 35,800 square miles of Southeast Asia ocean that now includes part of the Indian Ocean. Ships and aircraft from 12 countries are hunting for the plane. The operation includes the USS Pinckney, USS Kidd and USNS John Ericsson.
China posts images of possible plane debris
On Wednesday, the Chinese government published satellite images of what authorities suggested may be wreckage from the plane in the South China Sea. Planes sent Thursday to search the area off the southern tip of Vietnam found nothing. Malaysia said the Chinese Embassy had notified it that the images were released by mistake and did not show any debris from Flight MH370.
Stolen passports apparently not linked to terrorism
Malaysian and international police said two Iranians who boarded the flight with stolen passports had bought tickets to get to Europe, where they hoped to obtain asylum. Their presence on the flight had raised speculation of a possible terrorist link. Interpol Secretary-General Ronald Noble said neither man has a criminal record.
Malaysia Airlines has offered Chinese families of the missing a $5,000 "condolence" payment they say is not related to compensation. Some relatives have rejected the payment.