Missing plane: Key moments in video

Malaysia Airlines flight MH370 has been lost in the southern Indian Ocean, the Malaysian prime minister has said. But the precise whereabouts of the plane, and the chain of events that led to it crashing into the sea, remain a mystery.

The search

After weeks of searching, satellite images point to the likelihood of wreckage in an area of the southern Indian Ocean.

The remote location of the search area means a long flight before crew can begin searching the waves below.

The area is known as "the Roaring Forties" due to its notoriously strong winds

Rupert Wingfield-Hayes takes a tour of the Lockheed P-3 Orion as it embarks on a search for the missing plane.

Jon Donnison reports from Fremantle Port in Perth, where much of the search operation is based

Andy Moore explains how technology has focused the search for the wreckage

The families

In Beijing and Kuala Lumpur, families of the missing have been struggling to find ways to deal with the situation.

Malaysia's PM announced that the flight had been 'lost' - some relatives received the news by text message

Candlelight vigils and memorial services have been held in Malaysia

In Beijing, there have been angry scenes outside the Malaysian embassy

Some of the relatives have refused to believe that their loved-ones are dead

A ''wall of hope'' in Kuala Lumpur gives people a chance to express their emotions

The theories

What happened to the aircraft? The lack of a mayday call and the absence of the black box flight recorder has led to the emergence of numerous possible explanations of what happened on board flight MH370.

Krupa Padhy takes a look at some of the theories about what might have happened

It is believed unlikely that the disappearance was an act of terrorism

Richard Westcott explains what we do know of what happened aboard missing plane MH370

The authorities

The search for the plane has involved many different countries. The Malaysian authorities have given daily updates on their progress.

Malaysian PM Najib Razak: "According to this new data, flight MH370 ended in the southern Indian Ocean."

Australian PM Tony Abbott: "If there is anything down there, we will find it."

Malaysia Airlines chief executive Ahmad Jauhari Yahya defends his company's response to missing flight MH370

Malaysia's acting Transport Minister Hishammuddin Hussein says the search for the plane is "bigger than politics."

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