A masked man threatened a 27-year-old with a knife and robbed him of his phone as he walked home from the train station.
On Saturday afternoon the victim was walking toward Heelands on the Redway on Grafton Street junction with Patriot Drive, Milton Keynes at 3.10pm when a man produced the weapon and demanded he hand over his iPhone 5S.
The offender then ran from the scene across Grafton Street into Bradwell Common.
The offender is black, of a slim to medium build and around 6ft tall. He was wearing dark coloured jeans, a black hooded jumper with black and red on the arms, his face was covered by a material which was red and white with shapes on it, and he was carrying a rucksack with black straps.
Anyone with information should contact PC Chris Downs based at Milton Keynes police station via the Thames Valley Police 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 No personal details are taken, information is not traced or recorded and you will not go to court.