© Licensed to London News Pictures . 21/08/2012 . London , UK . A senior police officer speaks to protesters inside Brixton police station . Video has emerged of a man being detained in Brixton on Sunday ( 19th August ) during which it is alleged police officers stamped on the  man's head . Protesters march from Lambeth Town Hall to Brixton police station and deliver a formal complaint about the incident to the front counter . Photo credit : Joel Goodman/LNP