Investigators were questioning the ground crew of the missing Malaysia Airlines jet after Prime Minister Najib Razak disclosed that the aircraft's disappearance was a "deliberate" act, a police source said Sunday.
The source said investigators talked to some ground staff who had contact with flight MH370 before it left Kuala Lumpur International Airport on March 8, to find out if they knew anything that could provide clues to the missing aircraft.
"So far there are no positive results," he said, without giving the number of how many ground staff have been questioned. On Saturday, police searched the homes of the pilot and co-pilot of the missing Malaysian Airlines jet, a few hours after Najib said the plane's communication system was intentionally disabled and the aircraft flew for as much as seven hours to an unknown destination.
Two corridors have been identified from the satellite data where the plane could have flown: northward to Kazakhstan and Turkmenistan in Central Asia, or toward the southern Indian Ocean.
Aviation experts say that if the plane did attempt to make the northerly journey, it is highly unlikely it could have travelled through Indian airspace and over countries such as Afghanistan and Pakistan undetected by military radar.
As resources shifted to the Indian Ocean, Malaysian officials said the hunt for the plane would cease in the South China Sea, the focus of international search efforts for the past week.