A rabbi prays during a ceremony commemorating victims of Babi Yar massacre in Kyiv, Ukraine. Babiy Yar, the large ravine on the northern Kyiv outskirts, is known as the mass killing site where during WWII Nazis executed almost all Jews in Kyiv, many other city residents, prisoners of war and gypsies, with a total number of victims estimated to be more than 100,000 people.