Police patrols in South Northamptonshire have been increased after nine vehicles were broken into overnight last week and tools stolen.
The incidents happened last Thursday and Friday, and residents are being advised to be on the look-out for anyone acting suspiciously.
A police spokesperson said: “This type of incident happens very quickly and does not give us much opportunity for investigation as usually there are no witnesses and little forensic evidence.
“Our message is clear: Do not leave valuables in your vehicle, ensure it is locked and if it has an alarm, use it. Similarly if you have a garage, please use it.
“It is easy to fall into the habit of not parking your car in your garage, or not using a steering lock or the alarm system, but these quick and simple steps could be the difference in you becoming a victim of vehicle crime or not.
Officers would like to speak to anyone who may have witnessed any suspicious activity in Brackley last week or anyone who may have been offered any tools for sale.
Call police on 101 or Crimestoppers anonymously on 0800 555111.