Concerns over more serious contamination mounted in Japan on Friday after authorities warned that the core of one of the six reactors at the Fukushima nuclear plant may have been damaged, a day after three workers were exposed to high radiation while trying to stabilise the crippled unit.
Japan has decided to raise the severity level of the crisis at its tsunami-crippled Fukushima Daiichi nuclear power plant to the maximum seven on an international scale from the current status of five.
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