A young woman was raped after being approached by a man while on a night out in south-east London, police said.
The 19-year-old became separated from her friend and was waiting for a night bus at a stop in Blackheath Hill, Greenwich.
At approximately 4.15am, she entered a nearby block of flats with the suspect where she was later raped. After the incident she was able to escape and alert police.
The sex attack took place on 12 June 2016 but this week detectives released CCTV images of a man they would like to speak with in connection with the incident.
He is described as white, of a slim build, in his late twenties or early thirties, and approximately 5ft 9ins tall.
Detective Constable Alexandra Johnson, of the Met Police, said:"This was a horrific attack on a lone woman as she was simply trying to make her way home. A significant period of time has passed and we have exhausted all lines of inquiry.
"It is of paramount importance that anyone who recognises the man or has any information about the incident contacts as immediately."
Anyone with information is asked to contact detectives on 020 8721 4653 or Crimestoppers anonymously on 0800 555 111.