Police have said they are growing increasingly concerned as the search for missing student Daniel Williams entered its fourth day.
The 19-year-old was last seen around midnight on Thursday.
He was in a student union bar at the University of Reading’s Whiteknights campus, but friends reported him missing after he failed to return to his digs.
In a statement released on Sunday, Superintendent Jim Weems, of Thames Valley Police, said: “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 added: “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, a second year computer science student, is described as 6ft and slim, with short light brown hair and blue eyes. He was wearing black or blue jeans, a black hooded top, black shoes and a black T-shirt underneath with a white motif on the front.
Volunteers from the Berkshire Lowland Search and Rescue team have been assisting officers, along with the National Police Air Service.
Leaflet drops have also been arranged by Mr Williams’s family, who are from Sutton, in south London.