A protester chants slogans in front of the Turkish embassy during a march to commemorate the centenary of the mass killing of Armenians by Ottoman Turks, in Brussels, Belgium April 24, 2015. Thousands marched the streets of Brussels on Friday to commemorate the 100th anniversary of the start of the killing of up to 1.5 million Armenians by Ottoman Turkish forces a century ago. REUTERS/Francois Lenoir