Police have warned residents in and around Lynn to beware after a spate of more than a dozen break-ins at homes in the last month.
Homes in Gaywood, North Lynn and Fairstead have been targeted.
In some cases windows and doors have been forced open while many incidents have happened at properties left insecure during both the day and overnight.
Chief Insp Dave Buckley, commanding officer for West Norfolk, urged householders to be vigilant and get into the habit of checking doors and windows are locked when leaving the house and before going to bed.
He said: “Criminals will take advantage of any opportunity and we know burglars will try handles of homes until they find one which opens.
“The best way to prevent this is to check doors are locked before leaving the house or going to bed. Some of the incidents have happened in hours of darkness so I would urge residents to take measures to help protect homes including using automatic timers on lights or leaving the radio on giving a would-be thief the impression that someone is at home.”
The break-ins have included one at Bishops Road, Gaywood, on Sunday (November 2) between 2pm and 5pm. Thieves got in through an unlocked back door and took a black leather handbag containing about £80 in cash.
In a similar incident at Charlock, Fairstead, where a back door had also been left unlocked, a mobile phone, wallet and bank card, were taken. The card has since been fraudulently used to withdraw £400. The home was targeted on October 25 between 6pm and 8pm.
Chief Insp Buckley said residents can also help by looking out for anything suspicious.
He said: “Residents know their communities better than anyone else so if something or someone looks out of place then please call us. We can quickly dispatch officers to the scene and the sooner we are called, the greater chance we have of detaining a suspect.”
To report incidents of suspicious activity, call police on the non-emergency number 101 or if you believe a crime is in progress dial 999.
Anyone with information about the recent burglaries should contact King’s Lynn CID on 101 and further crime prevention advice is available at www.norfolk.police.uk