Details of the devastation caused by a 8.9 magnitude earthquake to strike Japan and the ensuing tsunami are starting to emerge.

Victor Sardina, of the Pacific Tsunami Warning Center, told the programme that a seven metre wave had already been registered on the Japanese coast.

The tsunami was "almost certain" to cross the Pacific and reach Chile, he said.

Correspondent Roland Burke, reporting from Tokyo, describes the ships swept inland in the wake of the tsunami.

"The water where it did come in, came in with an immense amount of force," he said.

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