POLICE say they are growing increasingly concerned for a teenager who has been missing for over a week and not been in touch with any friends or family.

Olivia Joel, 14, who has links to Slough, was last seen on Friday, December 15 at around 4pm. She was expected home in Camberley, Surrey, an hour later but did not return.

Surey Police is working with three other forces - Thames Valley, Essex and the Metropolitan Police to try and locate her. Officers now believe she caught a train from Camberley to Ascot railway station, then caught a further train into London Waterloo. They are still trying to trace where she travelled to after her arrival into London.

Police have also issued an image of Olivia whilst she was at Ascot station.

Det Insp Ian Cherrington, said: "We are growing increasingly concerned for the safety of Olivia, who has not been in contact with friends or family since she went missing.

"It's now a week since she went missing, and it is an anxious time for her family as they wait for news - particularly in the run up to Christmas.

"I hope this latest picture may draw more information from the public about where Olivia may be. If you have any information which might help officers locate her please call 101 urgently.

"My team are carrying out extensive enquiries in and around the local, London and Essex areas to find Olivia and anyone who has seen a girl matching her description or who knows about her whereabouts should call Surrey Police.

"Olivia, if you see any of the media appeals please contact us, the missing people charity free on 116000 or your nan to let us know you are safe and well."

Olivia is described as black, around 5ft 6 inches tall, with dark brown hair and was last seen wearing a dark blue Nike tracksuit and blue jacket. She is not believed to have spare clothes with her.

Anyone with information should call 101 and ask to speak to Surrey Police and quote the reference number 45170139615.