It is not known whether he is the perpetrator of the attack. A police spokesman told the dpa news agency that an investigation is underway to determine whether and how the suspect was involved in the attack.
Since an unknown person stabbed several people with a knife at a festival in the West German city on Friday evening, a major manhunt has been launched for the perpetrator. Police operations are underway across the country. On Saturday morning, police arrested a 15-year-old boy who was allegedly aware of the attack.