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A woman weeps during a moment of silence to pay tribute to those who lost their lives in the March 11, 2011 earthquake and tsunami in Tokyo, Sunday, March 11, 2012. Through silence and prayers Sunday, people across Japan 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/Junji Kurokawa)

A woman weeps during a moment of silence to pay tribute to those who lost their lives in the March 11, 2011 earthquake and tsunami in Tokyo, Sunday, March 11, 2012. Through silence and prayers Sunday, people across Japan 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/Junji Kurokawa)

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.