March 13, 2011
Residents evacuated from areas surrounding the Fukushima nuclear facilities damaged in Friday's massive earthquake, are checked for radiation contamination, Sunday, March 13, 2011, in Koriyama city, Fukushima prefecture, Japan. (AP Photo/Wally Santana)
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The second hydrogen explosion in three days rocked Japan's stricken Fukushima Dai-ichi nuclear plant Monday, sending a massive column of smoke into the air and wounding six workers. It was not immediately clear how much — if any — radiation had been released.