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Article updated: 3/16/2013 9:41 PM

Revelers mark St. Patrick’s Day

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Patricia Dunne of Detroit photographs The Chicago River being dyed green Saturday ahead of the St. Patrick's Day parade in Chicago.

Associated Press

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In downtown Chicago, thousands along the Chicago River cheered as workers on a boat dumped dye into the water, turning it a bright fluorescent green for at least a few hours in an eye-catching local custom.