Three men have been arrested after a member of the public spotted suspicious activity at a cashpoint.
Officers received a call shortly after midday on Saturday (12 March) to a report that a cash machine was swallowing cards without dispensing cash.
They then noticed two men approach the ATM and remove a device from the machine.
Officers searched the area and three men were arrested on suspicion of fraud related offences.
The incident occurred in Bath Road, Cheltenham.
Police believe those involved may have been targeting other ATMs in Cheltenham during the past week and would now like to speak to anyone who thinks they may have been a victim or who saw suspicious activity.
Anybody with information is asked to contact Gloucestershire Constabulary online through the website, quoting incident 196 of March 12.
Three men, a 21-year-old from Bristol, a 22-year-old from South London and a 23-year-old from Coventry, have all been released under investigation.