Lvov, a city in Poland, which was under the occupation of Soviet Union back in 1939, was as per the German-Soviet Pact. Approximately 200,000 Jews were present in the city of Lvov and 100,000 Jews came as refugees to Poland. Eventually, the Germans occupied Lvov when Soviet Union was invaded back in 1941.
When there was violence against the Jews by Germans, Ukrainians also joined the violence and killed nearly 4,000 Jews. There was another pogrom in July 1941 named the Petilura Days, where militants from Ukraine barged into Jewish districts and killed nearly 2,000 Jews brutally; while leaving thousands of them injured.
As of November 1941, there was a ghetto established by Germans and when sick Jews crossed the bridge to make way to the ghetto, thousands of Jews were shot dead. Later in March 1942, the Jews were getting deported. Towards the end, as much as 65,000 Jews were killed totally.