Three vehicles have been stolen in two days after owners left their engines running.
Police are reminding motorists not leave engines running and always keep their vehicles secure after three thefts this week in the Blackwood and Risca areas.
Blackwood and Risca Inspector, Aled George, said: "It only takes seconds for your car to be targeted.
"I want to remind residents to always lock windows and doors and please, remind family members of all ages to pass these crime prevention messages on."
The first theft took place on Monday, December 2, at around 12.50pm.
Gwent Police received a report of a theft of a Ford van from Medart Street in Crosskeys (crime ref: 1900444088).
How thieves are stealing cars with keyless entry:
Then the next day, two vehicles were reported stolen hours apart from neighbouring areas.
At around 8am, police received a report of a theft of a Vauxhall Corsa on Lillian Road in Blackwood, while the engine was running as the owner was defrosting the car (crime ref: 1900444893).
Later the same day, at around 2.20pm, there were reports of a theft of a Ford Transit while the vehicle was being unloaded in High Street in Fleur-De-Lys (crime ref: 1900445459).
And with Wales expecting snow over the next week, Gwent Police are now warning people not to leave their vehicles unsecured.
Inspector George added: "Opportunist thieves can be even more tempted at this time of year, with the colder weather, motorists can become complacent about their security, especially when defrosting the car."
Anyone who has any information about any of these incidents that may help police with their enquiries, should call 101 quoting the reference numbers.
You can also send a direct message to the Gwent Police Facebook or Twitter pages if you have any information. Alternatively, you can call Crimestoppers anonymously on 0800 555 111 or visit the website .
