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TOKYO — The situation surrounding Japan’s earthquake-damaged nuclear power infrastructure grew more serious Saturday, as the Japanese government declared states of emergency at four more nuclear reactors and prepared to issue an unprecedented order to release radioactive vapor from a fifth to ease building pressure.
Concern on Friday had been focused on the No. 1 reactor at the Tokyo Electric Power Co.’s Fukushima Daiichi plant, which lost power after a massive 8.9 magnitude earthquake struck off Japan’s northeast coast, unleashing a deadly tsunami that killed hundreds and caused widespread devastation.