People in Lincoln reported more cases of cash machines tampered with in the city following a police warning on Thursday.
Cash clawing scams were discovered on April 10 at Morrisons supermarket on Tritton Road and Tesco Express on lower High Street.
Since, three more incidents have been reported at Morrisons and another at the Birchwood Shopping Centre cash point.
The scam involves offenders attaching a device to where cash is dispensed, meaning when a customer uses the machine the cash does not come out.
Then, once the customer has left, the offenders return to take the money stuck near the opening.
Police advise that if you withdraw money from an ATM, but no cash comes out, to report it to the cash point operator and alert Lincolnshire Police on the 101 number.
If you don’t get your cash out from a machine, have a very close look at the slot, and if there is something to take out, remove it, as the cash could be in there.