A shopkeeper had his arm slashed by a gang of men armed with large kitchen knives who were robbing his store.
He suffered a two-inch gash from the attack as he opened the till for the six men.
They removed two tills and cash before running out of the One Stop Shop in Tenterden Crescent in Kents Hill.
They got into a white van – possibly in the shape of a VW Caddy – parked at nearby Shernfold and drove towards Groveway (H9).
Det Con Leanne Shepherd, based at Milton Keynes Force CID, is keen to speak to any witnesses who may have been in the area at the time who may have seen the robbery or the van near the scene.
She said: “This robbery has understandably left the victim shaken, and I would appeal to anyone with any knowledge relating to this crime to please come forward and contact us.
“We are clearly taking this offence extremely seriously and would like to hear from anyone who may have any information, not matter how insignificant it may seem, to get in touch.”
Two of the offenders were wearing all dark clothing, while a third had light grey clothing and a bright green face covering.
Two of the offenders are described as white and the third was black or mixed race.
Anyone with information can call the Thames Valley Police 24-hour service desk on 101.
If you don’t want to speak directly to police contact Crimestoppers anonymously on 0800 555 111.
No personal details are taken, information is not traced or recorded and you will not go to court.