BEIJING — A British submarine joined the search Wednesday for the missing Malaysia Airlines jet as Malaysian police said their investigation of the 227 passengers found no personal or psychological problems or motivation to hijack or sabotage the aircraft.
Authorities are continuing to investigate the pilot, copilot and 10 other crew members for clues to how and why
An unnamed senior U.S. official told ABC News on Wednesday that
On Thursday, eight military planes and nine ships were participating in the search for the
Wednesday's search turned up no evidence of aircraft debris.
The Tireless, a Trafalgar Class submarine that has joined the hunt, has advanced underwater search capabilities, Australian officials said. The British navy vessel Echo, a hydrographic survey ship, also was participating in the search.
An Australian vessel towing an acoustic detector that could pick up transmissions from the plane's cockpit voice and flight data recorders has apparently not arrived in the search area.
Malaysian Prime Minister
Houston said investigators were continuing to try to narrow the search area based on their analysis of satellite and other data but the task remained an extremely challenging one.
"We don't have a precise aircraft location for six hours before the aircraft went into the water somewhere," Houston said in a radio interview Wednesday. "So it's a very difficult task for the search coordination centers in Malaysia and also in Australia, [with] no precise data from which to start the search."