Police are "increasingly concerned"  for a missing teenager who has links to Watford and Hemel Hempstead.

Thames Valley Police have appealed for the public's help in finding Iris after she went missing from Aylesbury in Buckinghamshire on Friday, May 3.

They have now released CCTV images taken at the Westgate Oxford shopping centre soon after she went missing.

Update: Iris has been located safe and well, police announced on May 14.

The 17-year-old is white, around 5ft 8ins tall, of slim build and long brown hair. Officers believe she may be wearing a black and red jacket, black jeans, black trainers and a black cap.

She has known links to Hemel Hempstead and Watford, as well as Swindon, Wales, Liverpool, Manchester and Aylesbury.

PC Simon Lincoln said: “We are concerned for Iris’ welfare and would like to appeal for anyone with information, knows of Iris’ whereabouts or has possibly seen her to please contact the force.”

Any information can be reported by calling 101 and quoting reference 43240206731.