Japan

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A Japan Self-Defense Forces helicopter scoops sea water off Japan's northeast coast on its way to the Fukushima Dai-ichi nuclear power plant in Okumamachi, Japan, on Thursday morning, March 17, 2011. Helicopters dumped water on a stricken reactor at the plant in the country's northeast to cool overheated fuel rods inside the core. (AP Photo/Yomiuri Shimbun, Kenji Shimizu)

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Sailors move food and water onto an HH-60H Sea Hawk on the flight deck of the aircraft carrier USS Ronald Reagan on Tuesday off the coastline of Japan in the western Pacific Ocean. (Associated Press via U.S. Navy)

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HOMELESS: A woman walks around the devastated area in snowy and cold Ofunato in northern Japan where her home used to be before the earthquake and tsunami on Wednesday. Emperor Akihito appeared on TV across Japan in a prerecorded message that lasted about six minutes. (Associated Press/Kyodo News)

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This satellite photo taken on Wednesday, March 16, 2011, and provided by DigitalGlobe shows the damage to the reactor buildings of Units 1, 3 and 4 at the Fukushima Dai-ichi nuclear power plant in northeast Japan. Steam can be seen venting from the Unit 2 reactor building, as well as from the Unit 3 reactor building. (AP Photo/DigitalGlobe)

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Japan Self-Defense Force members search for survivors of the earthquake and tsunami Tuesday in the devastated city of Ofunato, Japan. (Associated Press)

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Japanese Prime Minister Naoto Kan discusses the disaster at the prime minister's official residence in Tokyo on Tuesday. Mr. Kan said the risks of further radiation leaks are increasing after an explosion at a nuclear power plant in Fukushima. (Bloomberg)

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This satellite image provided by DigitalGlobe shows the damaged Fukushima Dai-ichi nuclear facility in northeastern Japan on Monday, March 14, 2011. (AP Photo/DigitalGlobe)

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Villagers walk across sea of debris after they visited their homes, which were destroyed by Friday's tsunami, in Minamisanriku, in Japan's Miyagi Prefecture, on Tuesday, March 15, 2011. Japan's strongest recorded earthquake and subsequent tsunami slammed the country's eastern coast. (AP Photo/Shuji Kajiyama)

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A member of a British rescue team searches for victims in the tsunami-hit area in Ofunato, Iwate Prefecture, Japan, on Tuesday, March 15, 2011, four days after the disastrous earthquake and ensuing tsunami struck. (AP Photo/Itsuo Inouye)

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People walk along a road between the rubble of destroyed buildings in Minamisanriku, Miyagi prefecture, northern Japan on Monday. (Yomiuri Shimbun via Associated Press)

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An evacuee searches name lists for friends in Soma, Fukushima prefecture, Japan, on Monday. On top of the losses of family and friends, evacuees are now faced with the fears of radiation contamination from damaged nuclear facilities. (Associated Press)

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Evacuees gather around candlelight at a blacked-out shelter in Yamamoto, Miyagi prefecture, northern Japan on Monday, three days after northeastern coastal towns were devastated by an earthquake and subsequent tsunami. (Kyodo News via Associated Press)

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A man checks out a stock price board in Tokyo on Monday as the stock market plunged on its first business day after an earthquake and tsunami laid waste to cities along Japan's northeast coast. (Associated Press)

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Rescue workers carry an elderly man found alive by tsunami survivors after he was buried under rubble along a slope of a hill in Minamisanriku in Japan's Miyagi Prefecture on Monday, March 14, 2011, three days after a powerful earthquake-triggered tsunami hit the country's northeast coast. (AP Photo/The Yomiuri Shimbun, Hiroaki Ohno)

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A firefighter examines the damage of a house in Saito, in Japan's Miyagi Prefecture, on Monday, March 14, 2011, after Japan's biggest recorded earthquake slammed the country's eastern coast Friday. (AP Photo/Shuji Kajiyama)

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A ferry is stranded atop a building in Otsuchi, Iwate Prefecture, in northern Japan on Sunday, March 13, 2011, two days after a powerful earthquake-triggered tsunami hit the country's east coast. (AP Photo/The Yomiuri Shimbun)

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Natori, Japan, is seen in combination of photos by GeoEye. The photo on the left was taken April 4, 2010; the photo on right was taken Saturday, March 12, 2011, one day after an 8.9-magnitude earthquake struck the Oshika Peninsula. (AP Photo/GeoEye)

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In this image made from Japan's NTV/NNN Japan television footage, flames from the Fukushima Dai-ichi nuclear plant's Unit 3 rise in Okumamachi, Japan, on Monday, March 14, 2011. The second hydrogen explosion in three days rocked the stricken nuclear plant Monday, sending a massive column of smoke into the air and wounding 11 workers. (AP Photo/NTV/NNN Japan)

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In this image made frp, Japan's NTV/NNN Japan television footage, smoke ascends from the Fukushima Dai-ichi nuclear plant's Unit 3 in Okumamachi, Fukushima Prefecture, in northern Japan, on Monday, March 14, 2011. The second hydrogen explosion in three days rocked Japan's stricken nuclear plant, sending a massive column of smoke into the air and wounding 11 workers. (AP Photo/NTV/NNN Japan)

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Police lead rescue teams in the search for survivors among the damaged buildings and tsunami debris in Rikuzentakada, Iwate Prefecture, Japan, on Monday, March 14, 2011. Workers battled to prevent a nuclear meltdown after a second blast rocked an atomic plant north of Tokyo, as helicopters and convoys of army trucks headed toward areas hit hardest by Japan's strongest earthquake. (Koichi Kamoshida/Bloomberg)