Photo detail

In these combo images made from Japan's NHK television, the Fukushima Daiichi power plant's Unit 1 is seen before (top) and after (bottom) an explosion in Okumamachi, Fukushima prefecture, Japan, Saturday, March 12, 2011. The walls of the building at the nuclear power station crumbled Saturday as smoke poured out and Japanese officials said they feared the reactor could melt down following the failure of its cooling system in a powerful earthquake and tsunami. The damaged steel structure of Unit 1 can be seen at left after the walls crumbled. Japanese characters read: "before 9 a.m., top," and "at around 4:30 p.m."

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For battered Japan, a new threat: nuclear meltdown

IWAKI, Japan (AP) — Cooling systems failed at another nuclear reactor on Japan's devastated coast Sunday, hours after an explosion at a nearby unit made leaking radiation, or even outright meltdown, the central threat to the country following a catastrophic earthquake and tsunami.

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