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© Joel Goodman - 07973 332324 . 26/03/2011 . London , UK . Police detain a man inside a branch of HSBC in Cambridge Circus after a black bloc of protesters carrying black and red anarcho-syndiclist flags use a wheelie bin to smash through the doorway and spray graffiti on the walls . Hundreds of thousands of people attending an anti cuts demonstration under the banner " March for the Alternative " in central London , in protest at the coalition government's austerity measures . Photo credit : Joel Goodman