Hertfordshire police are concerned after a 16-year-old boy went missing from St Albans.
Duong was last seen shortly before 3pm on Saturday, January 13, and officers have now appealed for the public's help in finding him.
A spokesperson for Hertfordshire Constabulary said: "He is described as South East Asian, 5ft 5in tall, of a slim build and with short black hair.
"Duong was last seen wearing grey tracksuit bottoms and a dark red zip-up hoody.
"Officers are concerned for Duong’s welfare.
"If you have seen Duong since he was reported missing or have information about where he has been, you can report this by calling 999 immediately if you believe you are with Duong now, or have seen him in the last few moments."
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Information can also be reported to Hertfordshire police online at www.herts.police.uk/ro/report or by calling the police's non-emergency number 101, quoting ISR 16 of January 14.
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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