Thames Valley Police is appealing for witnesses to a robbery in Bletchley on Friday.
The incident happened in Ness Way, at around 1.45pm as the victim, a 14-year-old boy, had been to the shop in Serpentine Court.
He was riding a bike when he saw a teenage boy riding a black mountain bike towards him. The boy stopped and asked the victim and his friend for the time. He then asked the victim what he had with him and threatened him with a screwdriver.
The victim handed over his bag, which contained a white Netbook laptop. The offender placed the bag over his shoulder and cycled away towards Crummock Place, Lakes Estate.
Detective Constable Wendy Cissell, who is investigating the incident, said: “The victim felt understandably threatened in this incident and handed his property to the offender.
“I’m keen to speak to anyone who was in the area at the time or anyone who witnessed the offender cycling away from the scene.”
The offender is white, around 17-years-old, 5ft 11ins and slim. He was wearing a black cotton hooded top with the hood up and a black scarf covering the lower part of his face.
Anyone with any information about this incident should contact Det Con Cissell via the Force enquiry centre on 101.
If you don’t want to speak directly to the police you can contact the independent charity Crimestoppers anonymously on 0800 555 111 or online at crimestoppers-uk.org.No personal details are taken, information is not traced or recorded and you will not go to court.