Police in South Wales handcuffed an 18-year-old on Monday for a lethal hit. Officers say a car plowed into a cyclist on a quiet street near Newport. The victim died at the scene. The driver parked nearby, returned, and and drove off again. A man in the car was rushed to hospital with injuries. Cops also detained another man in connection with a caravan death. They let him go but laid down strict rules. He must stay home and report weekly.