Superintendent Jim Weems said in a statement: “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.”
He added that Daniel’s family are from Sutton, Surrey, and are being supported by specially trained officers.
“I would again urge people not to speculate as to the circumstances being Daniel’s disappearance,” he said. “We will continue to maximise all available resources into our search for Daniel, and would re-iterate that any sightings or information relating to his disappearance should be reported to Thames Valley Police.”
Williams is described as 6ft tall, slim build, with short light brown hair and blue eyes.
He was wearing black or blue jeans, a black hooded top and black shoes, and was also wearing a black t-shirt underneath with a distinctive white motif on the front.