new satellite data shows a missing airliner which disappeared over two weeks ago en route to Beijing crashed thousands of miles away in the southern Indian Ocean, Malaysian Prime Minister Najib Razak has announced.
All 239 people on board Malaysia Airlines Flight MH370, were presumed dead, airline officials said.
Analysis of satellite information from British company Inmarsat had shown that the Boeing 777's last position was in the Indian Ocean west of Perth, Australia, said Mr Najib. He added: "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."
The Prime Minister said families of the passengers and crew had been informed.
Relatives of those on board received the news in a Malaysia Airlines text message which said in English: "We have to assume beyond all reasonable doubt that MH370 has been lost and none of those on board survived."
After the message, there were hysterical scenes at the Beijing hotel where many of the relatives of those on board are staying. More than 150 of the passengers were Chinese.
People wailed, cried and dropped to the floor. One woman shouted out: "It's not possible, it's not possible."
At least four people being carried away on stretchers.
China's government immediately demanded Malaysia share all information and evidence which showed the plane went down in the Indian Ocean.
Mr Najib's comments came as an Australian navy ship was close to finding possible debris from the jetliner after a mounting number of sightings of floating objects that are believed to parts of the plane.
The search site is about 1550 miles southwest of Perth, in icy sub-Arctic seas that are in one of the most remote parts of the globe.
The objects, described as a "grey or green circular object" and an "orange rectangular object", were spotted yesterday afternoon, said Australian Prime Minister Tony Abbott, adding that three planes were also en route to the area.
Flight MH370 vanished from civilian radar screens less than an hour after taking off from Kuala Lumpur for Beijing on March 8. No confirmed sighting of the plane has been made since and there is no clue as to what went wrong.
In a further sign the search was bearing fruit, the US Navy was flying in its hi-tech black box detector to the area.
Investigators believe someone on the flight shut off the plane's communications systems. Partial military radar tracking showed it turning west and re-crossing the Malay Peninsula, apparently under the control of a skilled pilot.
That has led them to focus on hijacking or sabotage, but investigators have not ruled out technical problems.
Faint electronic "pings" also detected by Inmarsat suggested it flew for another six hours or so, but the initial analysis could do no better than place its final signal on one of two vast arcs, the north and south corridors.
Mr Najib said Inmarsat had been performing further calculations on the data.
He said: "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 UK Air Accidents Investigation Branch have concluded MH370 flew along the southern corridor, and that its last position was in the middle of the Indian Ocean, west of Perth."
Asked how Inmarsat experts had made the breakthrough, Chris McLaughlin, senior vice president for external affairs, said: "They tested the earlier findings against a number of known flights of other aircraft and came to the conclusion that only the southern route was possible."
The new method "gives the approximate direction of travel, plus or minus about 100 miles, to a track line," he added.
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