Police use water cannons in front of the Rote Flora alternative cultural centre during clashes at the so- called street party "Schanzenfest" in the Schanze district in Hamburg August 20, 2011. [Photo/Agencies]

Items are burnt at the entrance of a bank during clashes at the so-called street party "Schanzenfest" in the Schanze district in Hamburg August 20, 2011. The sign reads, "London is everywhere". [Photo/Agencies]