The search for a missing university student who disappeared from a union bar on Thursday has entered its fourth day.
Police are "extremely concerned" for the welfare of Daniel Williams, 19, who was last seen around midnight at the University of Reading's Whiteknights campus bar.
He was reported missing after he failed to return to his student accommodation.
Second year computer science student Daniel, who is from Sutton, is described as 6ft tall and slim, with short light brown hair and blue eyes.
He was wearing dark jeans, black shoes, and a black hooded top, under which he wore a black t-shirt bearing a distinctive white logo.
In a statement, Thames Valley Police Superintendent Jim Weems 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."
Volunteers from the Berkshire Lowland Search and Rescue team have been assisting Thames Valley Police, along with the National Police Air Service.
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