Police are appealing for information about a teenage girl who has been missing for five weeks.
They say concern is growing for the safety of 14-year-old Shelley Pratt from Croydon in Surrey.
Detectives have released new CCTV images which show her walking with a young black man along Croydon High Street just after midnight on Friday, November 9.
She is wearing her school uniform trousers and a hooded jumper with the slogan 'I love (heart symbol) London'.
Minutes later, police believe Shelly's Oyster card was used to board a route 60 bus heading towards Coulsdon.
The day before Shelley got off a 196 bus outside Harris Academy in South Norwood, Croydon, and walked south with a girl and a boy.
She was later spotted around 9.30pm on CCTV at George Street tram stop in Croydon town centre.
CCTV image of Shelley in Croydon High Street Detective Chief Inspector Mark Dunne said: "It has now been five weeks since Shelley went missing and concerns for her safety and welfare, especially in this extremely cold weather, are heightened.
"Shelley has had absolutely no contact with friends or family since her disappearance and it is possible that she may be with someone, perhaps in a house or a flat.
"I am encouraging people, particularly Croydon residents, to look closely at the image of the young man seen next to her.
"Do you recognise him or see him moments before approaching Shelley, talking to a number of passing girls on the opposite pavement, clearly trying to get their attention?"
Shelley's parents have urged her to get in touch Shelley, who is described as white and around 5ft 6in or 5ft 7in tall with long brown hair, has gone missing twice before but not for so long.
Her parents, Lisa and Tony Pratt, have begged her to come home in time for Christmas.
They said: "Shellz, please get in touch with us, we are desperate to hear your voice and know that you are safe and well.
"You're not in trouble. We love you and we miss you and just want you home, without you there will be no Christmas.
"Your presents are under the tree waiting for you. We are all missing you like mad. We love you - please, please come home."
Anyone with information is urged to call the Metropolitan Police incident room on 020 8721 4906.
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