Thames Valley Police is appealing for witnesses to an attempted robbery.
The incident happened in the Redway running parallel with Simpson Road, between Simpson and Walton Park at 4.55pm yesterday (24/11).
The victim, a 14-year-old girl, was walking along the Redway texting on her mobile phone when she heard someone running behind her.
She heard a shout and looked round to see a man with a knife. He demanded that she hand over her mobile phone.
The victim saw a car approaching and ran from the offender to the vehicle which had stopped and the driver called police. The offender ran off.
The offender is white, thin but with a muscular build, 5ft7ins, in his late twenties. He was wearing a black balaclava, a black glove on one hand, a black hooded top with a zip up the front, light blue jeans and grey and white training shoes. He spoke with a local accent.
Anyone with any information about this incident should contact Det Con Sam Reynolds, in Milton Keynes CID, via the 24-hour Police Enquiry Centre on 101.
If you don’t want to speak to police or leave your name, call the charity Crimestoppers on 0800 555 111.