Photos: May Day protests around the world

Police officers guard a Bank of America branch during May Day protests demanding everything from wage increases to an end to austerity measures Tuesday, May 1, 2012 in Oakland, Calif., Stinging gas has sent May Day protesters fleeing a downtown Oakland intersection as police took at least four people into custody. The chaotic scene recalls several earlier clashes between Occupy protesters and Oakland police. (AP Photo/Marcio Jose Sanchez)