Residents gather at the Okumamachi Town Hall to evacuate from the Fukushima Dai-ichi nuclear plant area in Okumamachi, northern Japan.

Tens of thousands of residents were evacuated from Okumamachi, Japan after tremors from Friday's quake blew out the cooling system at Tokyo Electric Power's Fukushima power plant about 160 miles north of Tokyo.

Water levels in Unit 2 of the nuclear reactor dropped sharply for a second time on Monday, increasing the risk of radiation, as well as the possibility of a meltdown.

"Units 1 and 3 are at least somewhat stabilized for the time being," Nuclear and Industrial Agency official Ryohei Shiomi said, AP reported. "Unit 2 now requires all our effort and attention."

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