Explosion Heard At No. 2 Reactor At Fukushimi Daiichi Nuclear Power Reactor

Japan's nuclear safety agency says an explosion has been heard at Unit 2 of the Fukushima Dai-ichi nuclear plant.

An agency spokesman speaking Tuesday on national television said the explosion was heard at 6:10 a.m. (2110 GMT).

No other details were immediately announced.

The troubles at the Fukushima Dai-ichi complex began when Friday's massive earthquake and tsunami in Japan's northeast knocked out power, crippling cooling systems needed to keep nuclear fuel from melting down.

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