People hold pictures of Armenian victims as they mourn during a ceremony to commemorate the 98th anniversary of the 1915 mass killing of Armenians in the Ottoman Empire on Taksim Square in Istanbul, Turkey on April 24, 2013. (Xinhua/Lu Zhe)

People hold pictures of Armenian victims as they mourn during a ceremony to commemorate the 98th anniversary of the 1915 mass killing of Armenians in the Ottoman Empire on Taksim Square in Istanbul, Turkey on April 24, 2013. (Xinhua/Lu Zhe)

People hold pictures of Armenian victims as they mourn during a ceremony to commemorate the 98th anniversary of the 1915 mass killing of Armenians in the Ottoman Empire on Taksim Square in Istanbul, Turkey on April 24, 2013. (Xinhua/Lu Zhe)

People hold pictures of Armenian victims as they mourn during a ceremony to commemorate the 98th anniversary of the 1915 mass killing of Armenians in the Ottoman Empire on Taksim Square in Istanbul, Turkey on April 24, 2013. (Xinhua/Lu Zhe)

People hold pictures of Armenian victims as they mourn during a ceremony to commemorate the 98th anniversary of the 1915 mass killing of Armenians in the Ottoman Empire on Taksim Square in Istanbul, Turkey on April 24, 2013. (Xinhua/Lu Zhe)

People hold pictures of Armenian victims as they mourn during a ceremony to commemorate the 98th anniversary of the 1915 mass killing of Armenians in the Ottoman Empire on Taksim Square in Istanbul, Turkey on April 24, 2013. (Xinhua/Lu Zhe)