Crooks have targeted a cash machine in Scarborough after police found a camera and card skimming device at the Post Office in Aberdeen Walk.
The hi-tech device was discovered by a member of the public who tried to use the machine late on Sunday evening.
Anyone who believes they may be a victim of the device should contact their bank. It is not yet known how long it was in place.
Meanwhile, police are warning members of the public to be cautious when using cash machines.
PC John Coleman, from Scarborough Police, said: “The most important thing is to cover your hand while you are typing in your pin number.
“Thieves use very sophisticated technology and the devices are often very difficult to spot. They will often be made to fit in with the colour and design of the machine.
“The devices consist of a card reader which is placed over the card slot, which records your card’s details, and a tiny pin-hole camera, which records your pin number as you type it in. The camera is usually stored in a strip of metal or plastic which looks like trim.”
Anyone with information should call police on 101.