Watch Movies2Watch. In the summer of 1941, German troops began a series of mass executions in the Latvian coastal city of Liepāja. Over the course of several months, firing squads killed over 5,000 Jews there. A German soldier filmed one of these executions. The footage surfaced after the War. These roughly 90 seconds of found footage, believed to be the only surviving film record of mass executions of Jews by the Einsatzgruppen, form the source material for this chilling film.