“Suddenly somebody rang the door. People outside were shouting that Berkin’s head is broken and that we should come down immediately. When I went out there was thick teargas and there were police in the street. It was hard to see what was happening. Berkin’s friends had already taken him to the hospital. By the… More Can the use of teargas be considered as a human rights violation? : A critical analysis on the policing of the Gezi Park protests