Japan nuclear meltdown 'maybe worse than thought'

Molten nuclear fuel at Japan's Fukushima plant might have eaten two thirds of the way through a concrete containment base, its operator said, citing a new simulation of the extent of the March disaster.

US experts unsure about Fukushima situation

US experts have expressed uncertainty about the seriousness of the situation at Japan's Fukushima nuclear complex, steering clear of speculation whether the core of one of the reactors there had been damaged.

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