Police say they are “extremely concerned” for the welfare of a university student who has been missing for four days.
Daniel Williams, 19, was last seen just after midnight in a student union bar at the University of Reading early on Thursday.
The teenager was reported missing after he failed to return to his campus accommodation.
The search for the computer sciences student entered its fourth day on Sunday.
Superintendent Jim Weems from Thames Valley Police said: “His disappearance is completely out of character and we are extremely concerned for his welfare.”
He added: “We remain open-minded as to the circumstances behind Daniel’s disappearance, but naturally, as the search enters its fourth day, our concern for him is growing.
“I would like to appeal to Daniel directly, if he sees this, please make contact with Thames Valley Police or your family.
“You are not in any trouble, but we want to ensure you are safe and well.”
Investigating officer Sergeant Bradley Pitt said: “We are appealing for anyone with information about Daniel’s whereabouts to get in contact with police as we are extremely concerned for his welfare.
“It is out of character for Daniel to be missing so please report any possible sightings of him to officers as soon as possible.”
Mr Williams was wearing black or blue jeans, a black-hooded top and black shoes when he was seen at the bar on the Whiteknight campus.
He was also wearing a black T-shirt underneath with a distinctive white motif on the front.
The second-year student is described as 6ft and slim, with short light brown hair and blue eyes.
Thames Valley Police has released images of Mr Williams in their effort to find him.
Volunteers from the Berkshire Lowland Search & Rescue team have been assisting officers from the police response teams and neighbourhood teams, along with the National Police Air Service.
Leaflet drops have also been arranged by Mr Williams’ family who are being supported by specially trained officers.
:: Anyone with information about his whereabouts is asked to call police on 101 quoting reference 1307 31/1.