A man was taken to hospital with head, hand and shoulder injuries when burglars hit him when they entered his home in Bletchley.
The incident happened at around 8.30pm on Wednesday at a home in Buckingham Road.
A group of men knocked on the front door, and when the victim opened the door one of the offenders struck him on the head, causing him to fall to the ground.
The same offender then demanded cash, stole some money and then left the address.
All the burglars were wearing dark clothing and balaclavas or other face coverings. At least three of the offenders were carrying weapons, including a wooden bat and an axe.
The 26-year-old victim was taken to Milton Keynes General Hospital for treatment but has since been discharged.
During the incident, another victim, a 25-year-old woman, jumped out of the first floor window of the building and sustained serious leg injuries. She was taken to Milton Keynes General Hospital for treatment where she remains in a serious but stable condition.
PC Sarah Lucas from Milton Keynes CID said: “This was a frightening incident for those involved but officers are doing everything they can to track those responsible.
“At this time we believe that this is not a random attack. Officers are in the area today conducting enquiries and I would urge anyone who has any concerns to speak to them. I would also like to speak to anyone who saw or heard anything in the area around this time. Please call 101.”
If you do not want to speak directly to the police you can contact Crimestoppers, anonymously, on 0800 555 111 or online at www.crimestoppers-uk.org