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Parts of northern Japan were rocked by three strong earthquakes on Saturday.

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More than 20 people are known to have died, and at least 2,000 were injured.

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The earthquakes tore up roads and destroyed houses.

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Even one of Japan's famous bullet trains was derailed - the first time this has happened.

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By Saturday night, thousands of people had made their way to evacuation centres, afraid of further tremors.

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On Sunday, tens of thousands spent another night in emergency shelters, as aftershocks continued to hit the area.

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Rescuers are continuing to search for those still stranded by heavy rains and mudslides caused by the quakes.

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On Monday, Tokyo's stock market fell sharply in response to the weekend's events.