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Last Updated: Tuesday March 15 2011 06:27 GMT

Third blast at Japan nuclear power plant

Collapsed building in Japan

Thousands still missing in Japan

There has been a third explosion at a nuclear power plant in Japan which was damaged in the massive earthquake that hit the country.

Dangerous radiation levels could harm people, so there's been a big evacuation of everyone living within 12 miles of the plant.

People living up to 18 miles away have been told to stay indoors to keep safe.

The explosions happened because the earthquake broke the reactors' cooling systems.

Experts are trying to stop more damage by flooding the nuclear reactors with sea water.

Around the country thousands of people are thought to have died in the earthquake and tsunami which followed.