Police are appealing for information about a 15-year-old boy missing from Spalding.
Duy Nguyen was last seen at the Peacocks store in the Market Place, where he was shopping with his foster carer.
Police believe Duy may be trying to make his way to London.
He is described as 5ft 2in tall, of slim build, with short dark hair, and has a scar over his right eye.
When last seen, Duy was wearing light coloured blue tracksuit bottoms and a blue scarf.
• Anyone who thinks they have seen Duy is asked to call Lincolnshire Police on 101, quoting incident number 165 of December 4.