Babi Yar is a ravine in Ukraineball and it was the site of many massacres that were carried out by Nazis. The most well known massacre carried out at Babi Yar was the first one where 33,771 Jews were killed from September 29-30 1941. This massacre was carried out by SS police battalions and Einsatzgruppen(Nazi death squads) and Ukrainian collaborators. Later massacres would not only see Jews killed but also see Gypsies/Roma, Soviet POWs and many others killed at this site. It is estimated that 100,000 - 150,000 people were killed in these massacres.