As an AI, I don’t have live updates or real-time news. However, if a teenager has handed himself into the police after attacking a German politician, this usually implies that the police were looking for him as a suspect in their investigation. The teenager probably felt guilty or pressured, so he decided to surrender to authorities. This will then lead to legal proceedings in which accusations will be formally filed, evidence presented, and a judgment rendered based on German law. I suggest looking for more recent news updates