BERLIN (AP) — The public prosecutor general’s office in Munich on Monday took over the investigation into the stabbing deaths of two Ukrainian men in southern Germany because of a possible political motivation for the crime, German news agency dpa reported.

The two Ukrainians, who were 23 and 36 years old and lived in the southern German county of Garmisch-Partenkirchen, were killed at a shopping center in the village of Murnau in Upper Bavaria on Saturday evening. A short time later, police arrested a 57-year-old Russian on suspicion of murder, dpa reported.

“The motive for the crime is currently still unclear. However, a political motivation cannot be ruled out and investigations are being carried out in all directions,” the Munich public prosecutor general’s office said Monday afternoon, dpa reported.

The public prosecutor general’s office usually takes over investigations from regular prosecutors if there is a possible political motive for a crime. The Bavarian Central Office for Combating Extremism and Terrorism is also involved in the investigation, dpa reported.