BERLIN - MAY 01:  A garbage container explodes after a fire was set during May Day clashes between police and mostly left-wing protesters in Kreuzberg on May 1, 2009 in Berlin, Germany. Berlin police earler in the day arrested 57 people in protests that turned violent. A police spokesman said 48 police officers were injured earlier during the clashes.  (Photo by Carsten Koall/Getty Images)