Demonstrators shout anti-goverment slogans as they attend commemoration for Berkin Elvan in Istanbul March 7, 2015. Hundreds march in Istanbul's Okmeydani district to commemorate the death of Berkin Elvan, a fifteen year-old boy who died after nine months in a coma from a head wound sustained during anti-government protests in 2013. REUTERS/Osman Orsal (TURKEY - Tags: POLITICS CIVIL UNREST)