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A family observes a moment of silence in front of what is left of a disaster control center in an area devastated by the March 11, 2011 earthquake and tsunami, in Minamisanriku, Miyagi prefecture, Japan, Sunday, March 11, 2012. Through silence and prayers, people across Japan on Sunday remembered the massive earthquake and tsunami that struck the nation one year ago, killing just over 19,000 people and unleashing the world's worst nuclear crisis in a quarter century. (AP Photo/Shizuo Kambayashi)

Japan mourns tsunami dead

With a minute of silence, tolling bells and prayers, Japan marked the first anniversary of an earthquake and tsunami that killed thousands and set off a nuclear crisis that shattered public trust in atomic power and the nation's leaders.