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Malaysia says jet's disappearance was deliberate; investigation refocused on crew, passengers

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    A crying woman, one of the relatives of Chinese passengers aboard missing Malaysia Airlines Flight MH370, is assisted by volunteers as she leaves a hotel ballroom where families were briefed on rescue and searching efforts in Beijing, China, Friday, March 14, 2014. (AP Photo/Alexander F. Yuan)The Associated Press

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    A woman walks past message cards tied up for passengers aboard a missing Malaysia Airlines plane, outside a shopping mall in Kuala Lumpur, Malaysia, Friday, March 14, 2014. A U.S. official said that the missing Malaysia Airlines flight MH370 pinged a satellite for four hours after it went missing, indicating that it may have stayed in the air long after its last contact with the ground. Malaysian authorities are widening their search westward, toward India, as a result. (AP Photo/Lai Seng Sin)The Associated Press

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    A cabin crew of the Vietnam Air Force is seen onboard a flying AN-26 Soviet made aircraft during a search operation for the missing Malaysia Airlines flight MH370 plane over the southern sea between Vietnam and Malaysia Friday, March 14, 2014. Vietnam says it has downgraded but not stopped its search for the missing jetliner in the South China Sea and has been asked by Malaysian authorities to consider sending planes and ships to the Strait of Malacca. (AP Photo/Na Son Nguyen)The Associated Press

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    FILE – In this Nov. 14, 2005 file photo, clouds hang over the North Sentinel Island, in India's southeastern Andaman and Nicobar Islands. India used heat sensors on flights over hundreds of uninhabited Andaman Sea islands Friday, March 14, 2014, and will expand its search for the missing Malaysia Airlines jet farther west into the Bay of Bengal, officials said. The Indian-controlled archipelago that stretches south of Myanmar contains 572 islands covering an area of 720-by-52 kilometers. Only 37 are inhabited, with the rest covered in dense forests. (AP Photo/Gautam Singh, File)The Associated Press

The Malaysian jetliner missing for more than a week had its communications deliberately disabled and its last signal came about 7 1/2 hours after takeoff, meaning it could have ended up as far as Kazakhstan or deep in the southern Indian Ocean, Malaysia's leader said Saturday.

Prime Minister Najib Razak's statement confirmed days of mounting speculation that the disappearance of the Malaysia Airlines Boeing 777 was not accidental, and underlines the massive task for searchers who have been scouring vast areas of ocean.

"In view of this latest development, the Malaysian authorities have refocused their investigation into the crew and passengers on board," Najib said, stressing they were still investigating all possibilities as to why the plane deviated so drastically from its original flight path.

"Clearly the search for (Flight) MH370 has entered a new phase," Najib told a televised news conference.

The plane was carrying 239 people when it departed for an overnight flight from Kuala Lumpur to Beijing at 12:40 a.m. on March 8. The plane's communications with civilian air controllers were severed at about 1:20 a.m., and the jet went missing in one of the most puzzling mysteries in modern aviation history.

Najib said investigators now have a high degree of certainly that one of the plane's communications systems — the Aircraft and Communications Addressing and Reporting System — was disabled before the aircraft reached the east coast of Malaysia. Shortly afterward, someone on board then switched off the aircraft's transponder, which communicates with civilian air traffic controllers.

The prime minister then confirmed that Malaysian air force defense radar picked up traces of the plane turning back westward, crossing over Peninsular Malaysia into the northern stretches of the Strait of Malacca. Authorities previously had said this radar data could not be verified.

He then said the last confirmed signal between the plane and a satellite came at 8:11 a.m. Malaysian time — 7 hours and 31 minutes after takeoff. Airline officials have said the plane had enough fuel to fly for up to about eight hours.

"The investigations team is making further calculations which will indicate how far the aircraft may have flown after this last point of contact," he said.

Najib said authorities had determined that the plane's last communication with a satellite was in one of two possible "corridors" — a northern one from northern Thailand through to the border of Kazakhstan and Turkmenistan, and a southern one from Indonesia to the southern Indian Ocean.

He said that searching in the South China Sea, where the plane first lost contact with air traffic controllers, would be ended.

The current search involves 14 countries, 43 ships and 58 aircraft.