Update: At around 3.35pm on Tuesday South Wales Police said Ismail Farah had been found "safe and well".
Police have said there is "real concern" for the welfare of an 18-year-old reported missing in Cardiff.
Ismail Farah, from Butetown, was last seen at home at around 4am on Tuesday April 27.
Officers are appealing for anybody with information on his whereabouts to come forward.

In an appeal officers say there is "real concern" for his welfare and that his family are "extremely worried".
Ismail was last seen wearing a black tracksuit, jacket & white headphones.
Anyone with information relating to Ismail or is aware of his location, is asked to contact South Wales Police.
Can you help? Call South Wales Police on 101 or Crimestoppers, anonymously, on 0800 555111 quoting reference number 146226.