Japan Declares Nuclear Emergency After Earthquake, Tsunami

Officials say the state of emergency is a precautionary measure.

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Japan has declared a state of atomic power emergency in the wake of a massive earthquake Friday. Japan has 50 nuclear power reactors nationwide, but Japanese officials say the state of emergency is a precautionary measure. Meanwhile, emergency personnel are gearing up for aftershocks in Tokyo, where tremors caused a roof to collapse, killing at least one person. Rail services have been disrupted, leaving millions stranded, Reuters reports. And over 20,000 have been stranded at two of Japan's major airports. Because of overloaded mobile phone service, many are having trouble returning home or getting in touch with friends and family members.  [See photos of the earthquake and tsunami in Japan.]