There was a third explosion at the Fukushima Daiichi nuclear plant Tuesday — at yet a third reactor. Officials also revealed there was a fire. That makes four reactors now involved. Experts are still struggling to understand the cause of an explosion and also a fire at the badly damaged nuclear reactor complex in Japan. A significant pulse of radioactive gas went into the atmosphere as a result of these events — though the levels have since subsided according to Japanese officials. Japan has evacuated residents within 12 miles of the plant as a precaution. Michele Norris talks to NPR's Richard Harris, who has the latest from Tokyo about the nuclear reactor crisis in Japan.
At Japanese Plant, Four Reactors Now Involved
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