German police arrested a 29-year-old man on suspicion of being a member of the so-called Islamic State group (Daesh) and planning an attack with a vehicle, federal prosecutors said Wednesday, the Washington Post reported.

The man, a German citizen identified by prosecutors only as Dasbar W., was arrested by a police tactical response unit in the southwest German city of Karlsruhe.

Prosecutors said that W. began distributing Daesh propaganda material online between April and July 2015, and trained others to hide their Internet address and use so-called messenger services. He allegedly traveled to Iraq in June 2015, where he joined Daesh, received firearms training and scouted targets for an attack in the northern Iraqi city of Irbil.