By 2 July 1941, the individual, planned executions continued. At approximately 3 o'clock in the evening Prof. Kazimierz Bartel was arrested by one of the "Einsatzgruppen" operating in the area. During the night of 3/4 July, several dozen professors and their families were arrested by German detachments – each one consisting of an officer, several soldiers, Ukrainian guides and interpreters. The lists were prepared by their Ukrainian students associated with OUN. Some of the professors mentioned on the lists were already dead, specifically Adam Bednarski and Roman Leszczyński. Among those arrested was Roman Rencki, a director of the Clinic for Internal Diseases at Lwów University, who was kept in an NKVD prison and whose name was also on the list of Soviet prisoners sentenced to death.