The 31-year-old suspect was arrested at his home in Hanau based on a tip from a witness. It turned out he had been drinking a lot.
Authorities have not ruled out that the act was an impulsive response to an occupational problem. The police currently assume that the blood found comes from the man. He will be examined in a psychiatric clinic. Swastikas, the symbol of the Nazi movement, are banned in Germany.
In Hanau, east of Frankfurt am Main, a 43-year-old German right-wing extremist shot dead nine young people for racist reasons in early 2020. Then he killed his mother and himself.