Police have arrested a man on Tuesday for allegedly dragging a 16-year-old boy under his pickup truck following a traffic accident in the city of Sunagawa, in central Hokkaido.
The late-night collision occurred on Saturday and left four members of a five-member family dead.
The body of the teenage son, who was one of the victims, was found 1.5 km away after apparently being ejected from the vehicle he was riding in and dragged along by a third vehicle.