Mark Norton places flowers on the grave of his son Will Norton, who died a year ago when he was sucked out of his car on the way home from his high school graduation by an EF-5 tornado that tore through Joplin, Mo. (AP Photo/Charlie Riedel)
Joplin commemorates anniv. of tornado
A year after a massive tornado tore through Joplin, thousands of survivors and others touched by the storm's fury made a somber march through some of the hardest-hit neighborhoods in a town.
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