Members of the Armenian clergy take part in a mass marking the 100th anniversary of the mass killings of 1.5 million Armenians by Ottoman Turkish forces, in Jerusalem's Old City April 24, 2015. Hundreds of Armenians gathered on Friday for a mass followed by a protest in front of the Turkish consulate general demanding Turkey accept their view that the massacre a century ago was a genocide. Armenia says the 1915 massacres during World War One constitute genocide -- a term used this month by Pope Francis. Muslim Turkey accepts many Christian Armenians were killed in partisan fighting during the war, but denies it amounted to genocide. REUTERS/Amir Cohen