UPDATE: Wiktor has now been found.
A 12-year-old boy has been reported missing from Mansfield.
Police say they're concerned for the safety of Wiktor Pietrzak, who was last seen at around 9am on Saturday, February 1.
He went missing from the Mansfield area.
He is thin and about 4ft 8ins tall.
Wiktor has short, straight, dark brown hair and was last seen wearing a blue and purple hoodie, navy blue shorts with an orange stripe and grey trainers.
Anyone who may have seen him or has information about his whereabouts is asked to call Nottinghamshire Police on 101, quoting incident 337 of February 1.