Frost is forecast in the next few days, which may result in frozen windscreens. Last winter dozens of cars were stolen in Leicestershire while owners left them defrosting with their car engines running.
Chief Inspector Chris Baker said: “These days vehicle security means it is very difficult to steal a car unless you have the keys. Thieves know this, and see frosty mornings as an opportunity. They get up early, and will be looking for cars to steal. While it may be tempting to nip back into your house or flat while the windscreen is clearing, I would ask you to stay with your vehicle. If you find your car has been stolen while you have left your keys in it, you may find your insurance will not cover you. You could also be guilty of an offence if you leave the engine running while it is parked on the road.”