Thieves stole cars, laptops and phones during a two-day burglary spree across Aylesbury.
The thefts took place overnight between Thursday 25 and Friday 26 September when criminals broke in through UPVC doors.
Between 11.30pm on Thursday and 7am on Friday thieves stole two cars and a laptop after burgling a home in Ravensbourne Road and a handbag, car keys, two mobile phones and a laptop from a house in Ebble Close.
Between 10pm on Thursday and 7am on Friday criminals also broke into a house in Deverill Road but despite them turning the rooms over, nothing was stolen.
Between 10.55pm and 11.30pm on Thursday they also broke into a house in Palmer Avenue, stole the car keys for a MG ZT car and then took it from the driveway.
In each case, the thieves gained access to the house through unsecure UPVC doors.
Insp Kelly Glister said: “I would like to remind residents to securely double lock their UPVC doors.
“Locking your UPVC door involves two simple steps - pull up the handle to engage any additional bolts and use the key to securely lock the door.
“It is vital to remember that a UPVC door is only securely locked if you use the key.
“If you just pull the handle up this does not fully lock the door and prevent entry.
“Please remain extra vigilant and if you see any suspicious persons or vehicles please report this to the police via the 101 number.”
Officers are patrolling the areas to prevent further break-ins and are asking that residents ensure their doors are properly secured.
If you have any information about this series of burglaries please contact police via the enquiry centre on 101 or Crimestoppers anonymously on 0800 555 111,