Explosion at nuclear plant in Japan
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Japan quake: Second blast at Fukushima nuclear plant

A second explosion has hit the nuclear plant in Japan which was damaged in Friday's earthquake.

TV footage showed smoke rising from Fukushima plant's reactor 3, a day after an explosion hit reactor 1.

Japan's nuclear safety agency said the blast was believed to have been caused by the build-up of hydrogen.

Chief Cabinet Secretary Yukio Edano said the core container at the reactor was still intact.

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