People are being urged to be on their guard after three burglaries in Aylesbury.
On each occasion, the crooks broke in using an unknown tool to open UPVC doors.
Homes in Ascott Road, Cleveland Road and Cannock Road were targeted overnight and police believe the burglaries are linked.
PC Samantha Stansbie said: “Burglars are opportunists and an insecure premise is far more likely to be targeted.
“Therefore, I would like to remind residents of the importance of making sure you lock all windows and remember to double lock UPVC doors using a key, just lifting the handle does not lock the door.”
At 2.45am yesterday (Monday), burglars broke into an Ascott Road house by propping open a UPVC door with an unknown tool.
Once inside, they searched the home but were disturbed by the occupant.
They stole a purse, cash, jewellery and a USB cable.
An hour later, thieves used a tool to open the UPVC front door of a house in Cleveland Road.
A cash tin was stolen, although this has now been recovered.
The third burglary took place between 11pm on Sunday and 8am on Monday.
Crooks broke into the Cannock Road house using an unknown tool to open the UPVC front door.
Computer console games, cash, wallets and purses were stolen.
PC Stansbie said other tips included locking side gates to prevent access to the rear of a property.
She said: “Do not leave ladders and garden tools in your garden, please lock them away in your shed, trim high hedges to improve natural surveillance, and consider fitting security lighting and a burglar alarm.”
Anyone with information about the burglaries should contact PC Stansbie by calling 101.
Alternatively you can call Crimestoppers anonymously on 0800 555 111.