A man stole a mobile phone from a woman.
The theft took place some time between 11.50pm and midnight on Saturday, August 10.
The 18-year-old woman was sitting on a bench in the car park of Oasis retail park in Corby town centre with friends when a man on a bike approached them and started to talk to them.
After a few minutes the man took her mobile phone, which was on the bench, and left.
He was white, about 25, and thin, with short dark hair.
He was wearing a dark coloured T-shirt, grey tracksuit bottoms and was riding a blue bike.
Officers would like to speak to anyone who may have witnessed the incident or who may have any information regarding it.
Witnesses to this incident, or anyone with information, should call Northamptonshire Police on 101 – alternatively, information can be given anonymously to Crimestoppers on 0800 555 111.