An alleged robber fled a property in Buxton with head injuries after one of the occupants fought back with a hammer.
Derbyshire officers are appealing for anyone with information about the incident, which occurred on Fairfield Road on Friday, April 6, to come forward.
At around 9.30am, three men with their faces covered and wearing gloves are reported to have entered a property on Fairfield Road.
One occupant, who was reportedly threatened with a screwdriver, armed himself with a hammer and caused head and shoulder injuries to the intruder.
The trio, including the injured man, then fled the building.
Several mobile phones, a quantity of cash and a debit card were later reported missing.
If you witnessed the incident, or have any information, please call DC Danielle Podam on 101 quoting reference 18000154253.
Alternatively, send her a message online through the Contact Us page of the website, www.derbyshire.police.uk.
You can also call Crimestoppers anonymously on 0800 555 111.