The missing Malaysia Airlines jet came down in the Indian Ocean, Prime Minister Najib Razak said Monday, as the airline reportedly told relatives it had been lost and that none on board survived.
Najib Razak said flight data suggested that the Boeing 777's "last position was in the middle of the Indian Ocean west of Perth, Australia."
He added: "This is a remote location, far from any possible landing site. It is therefore with deep sadness and regret that according to this data the flight ended in the southern Indian Ocean."
Flight 370 disappeared from radar screens less than an hour after taking off from Kuala Lumpur for Beijing with 239 people on board.
Here is the full statement from the Malaysian Prime Minister:
"This evening I was briefed by representatives from the UK Air Accidents Investigation Branch (AAIB).
They informed me that Inmarsat, the UK company that provided the satellite data which indicated the northern and southern corridors, has been performing further calculations on the data.
Using a type of analysis never before used in an investigation of this sort, they have been able to shed more light on MH370's flight path.
Based on their new analysis, Inmarsat and the AAIB have concluded that MH370 flew along the southern corridor, and that its last position was in the middle of the Indian Ocean, west of Perth.
This is a remote location, far from any possible landing sites. It is therefore with deep sadness and regret that I must inform you that, according to this new data, flight MH370 ended in the southern Indian Ocean.
We will be holding a press conference tomorrow with further details.
In the meantime, we wanted to inform you of this new development at the earliest opportunity.
We share this information out of a commitment to openness and respect for the families, two principles which have guided this investigation.
Malaysia Airlines have already spoken to the families of the passengers and crew to inform them of this development.
For them, the past few weeks have been heartbreaking; I know this news must be harder still. I urge the media to respect their privacy, and to allow them the space they need at this difficult time."
-- AFP contributed to this report.