Anyone who used these ATMs recently should check for unauthorized withdrawals.
NORRISTOWN, Pennsylvania (WPVI) -- Skimming devices on ATMs in Montgomery County may have exposed users' banking information.
The tampered machines are located at two 7-Elevens in Norristown and a 7-Eleven in Conshohocken.
The Norristown locations are 708 East Johnson Highway and 1335 Sandy Hill Road.
The Conshohocken location is at 601 Fayette Street.
"Being proactive, knowing we have two 7-Elevens here in town, we had our detectives go up and check, and sure enough in both locations we had the same type of device that was found," said Norristown Police Chief Mike Bishop.
Police say the skimming devices were located internally.
In addition, a small camera was placed above the keypad, to the right, to capture users entering their PIN.
"These are insert devices with a hidden camera, so there would be a camera overlooking the keypad and an actual inserted device into the machine that would skim the card's data," said Lt. James Angelucci with Norristown police.
Investigators say the thieves can obtain all that credit card data via Bluetooth to steal your identity.
Detectives say the device is often an overlay that someone sticks onto the card reader, so it won't be sturdy.
Here's what to look for when using an ATM or even a gas pump.
"The machine is unsecure, there are loose wires and a camera over top of the keypad, the keypad is spongey. These are indicators that there is a skimming device involved," said Lt. Angelucci.
Conshohocken police also offered the following tips:
-When using an ATM the best practice is to check for any items that appear suspicious around the area of the keypad or where the card is inserted.
-Even if a camera isn't observed, it is best to cover the keypad with your hand while typing in your PIN.
Anyone who used these ATMs recently should check for unauthorized withdrawals, and contact their banks.
If you've used any of the tampered ATMs recently you should contact your bank immediately and report any fraudulent activity.