A 24-year-old with links to Cricklewood, London, has gone missing from Borehamwood.
Daniel was last seen at around 1.25am on Saturday (October 14), on Shenley Road.
Officers have now appealed for the public's help in finding him.
A spokesperson for Hertfordshire Constabulary said: "We are appealing for the public’s help to trace a man who has gone missing from Borehamwood.
"He is described as 6ft 2in tall, of medium build, clean shaven and bald.
"He was last seen wearing a T-shirt, dark trousers, a blue jacket and trainers.
"Officers are concerned for his welfare.
"If you have information, you can report this by calling 999 immediately if you believe you are with Daniel now, or have seen him in the last few moments."
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Information can also be reported online at www.herts.police.uk/ro/report or by calling the police's non-emergency number 101.
Hertfordshire police's web chat function can be used by visiting herts.police.uk/contact.
Anonymous information can be given by contacting Crimestoppers on 0800 555 111 or via crimestoppers-uk.org.
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