Top 50 UPI photos of 2012 (51 images)

A collection of the year's top photos from UPI Photographers around the world.
Updated: Dec. 27, 2012 at 4:42 PM
37 of 50
Police and demonstrators clash during a May Day protest in Oakland, California on May 1, 2012. Police made arrests and threw tear gas. UPI/Terry Schmitt
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