Thieves who stole three cars in Sheffield are being hunted by the police.
A Vauxhall Insignia was stolen from Shirland Lane, Darnall, between 6pm on Friday, July 27 and noon the following day.
A Renault Clio was taken from Hastilar Road South, Woodthorpe, between 9pm on Friday and 8am on Saturday and a Citroen DS3 was taken from Woodhouse between 6pm and 8pm on Saturday.
Police chiefs in South Yorkshire have issued some crime prevention advice in a bid to drive down vehicle crime.
Motorists are being urged to think about where they leave their keys.
A spokesman said: "Did you know that the latest technique used by criminals to steal cars is letterbox fishing? Letterbox fishing is where thieves put a pole through a letterbox to take your keys.
"The burglar then has the opportunity to let themselves into your home and take your car. Always keep your handbag or keys away from ground level doors. Ideally, you should leave them on the first floor or above."
Motorists are also being advised to park their vehicles facing towards their homes.
The spokesman added: "After a long day away from home, the way you park is the last thing on your mind. When you arrive at home most people tend to reverse on to their drive to make it easier for them to leave the house.
"However, doing this makes it easier for someone to take your car from your driveway. Make sure you park facing your house and don’t forget to lock your wheels too."
Anyone with information should call South Yorkshire Police on 101.