A woman was killed and a man was seriously injured when they were hit by a car on a street in Hisingen.
The 17-year-old and an older brother of his are suspected of murder and attempted murder. The woman was the brothers’ mother.
Two people in their 60s, who are related to the murder suspects, are in custody on suspicion of aggravated protection of a criminal.
According to the prosecutor, the suspected crimes may have a so-called honor motive.