text: The incident happened in December when the 18-year-old man suffered what was described at the time as a broken jaw.
  Police want to trace a woman and a man.
  The woman is described as being in her late teens to early 20s, with long brown hair. The man is thought to be in his early 20s.
  The woman was wearing a beige-coloured jacket and beige knee-high boots.
  The man was wearing a dark blue puffy jacket, blue jeans and grey and black trainers.
  PC Graham Crawford said: "This is a serious incident resulting in a male sustaining a severe facial injury.
  "Violent behaviour will not be tolerated and I would urge anyone who recognises the male and female pictured, or has any knowledge of this incident to come forward and contact the police."
target: Police investigating an "unprovoked serious assault" on a teenager outside Stonehaven railway station have released CCTV images of a woman and man they want to trace.