Man is said to have killed parents and brother. The man's sister was seriously injured on Tuesday evening, the police and public prosecutor's office announced on Wednesday.
The suspect was therefore arrested in the Waldshut district of Germany. The 19-year-old was arrested on suspicion of murder and attempted murder, according to the police. The investigation into the incident is ongoing, police said in a statement. The incident occurred in the town of Waldshut in the state of Schleswig-Holstein in Germany.