10.40 Our South Asia Editor Dean Nelson was at the press conference in Kuala Lumpur, and has sent through the following notes:
The pilot of MH370 had either switched off the plane's radar and transponders when he said goodnight to Malaysian air traffic controllers or had done so under duress by hijackers, Malaysia's transport minister said.
The police investigation is focussing on crew, passengers and ground staff. The perpetrator/s had one of four motives/causes: hijacking, sabotage, personal problem or psychological problem.
Passengers from four different countries have been investigated by their own intelligence agencies and cleared of any suspicion.