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Japanese Emperor Akihito, right, and Empress Michiko bow during the national memorial service for the victims of the March 11, 2011, earthquake and tsunami in Tokyo Sunday, March 11, 2012. Through silence and prayers, people across Japan on Sunday remembered the massive disaster 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/Japan POOL) JAPAN OUT

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.