A 16-year-old boy has gone missing from Stevenage.
Riley was last seen on the morning of Sunday, September 17, and has not been heard from since.
Hertfordshire police are now appealing for the public's help as they attempt to find the teenager.
Riley is described as being 5ft 6in tall and of slim build, with short, dark brown hair.
When he was last seen, he was wearing a tracksuit and cap.
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Police officers say they are "concerned for his welfare".
If you believe you are with Riley now or have seen him in the last few moments, you are asked to call 999 immediately.
Information can also be reported online at herts.police.uk/report, via web chat at herts.police.uk/contact, or by calling 101. You should quote ISR 015 of September 18, 2023.
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