The Rumbula massacre is a collective term for incidents on two non-consecutive days (November 30 and December 8, 1941) in which about 25,000 Jews were killed in or on the way to Rumbula forest near Riga, Latvia, during the Holocaust. Except for the Babi Yar massacre in Ukraine, this was the biggest two-day Holocaust atrocity until the operation of the death camps. About 24,000 of the victims were Latvian Jews from the Riga Ghetto and approximately 1,000 were German Jews transported to the forest by train. The Rumbula massacre was carried out by the Nazi Einsatzgruppe A with the help of local collaborators of the Arajs Kommando, with support from other such Latvian auxiliaries. In charge of the operation was Higher SS and Police Leader Friedrich Jeckeln, who had previously overseen similar massacres in the Ukraine. Rudolf Lange, who later participated in the Wannsee Conference, also took part in organising the massacre. Some of the accusations against Latvian Herberts Cukurs are related to the clearing of the Riga Ghetto by the Arajs Kommando. The Rumbula killings, together with many others, formed the basis of the post-World War II Einsatzgruppen trial where a number of Einsatzgruppen commanders were found guilty of crimes against humanity.