1st Bank issued new cards to hundreds of customers in Denver and Boulder, after skimmers were found on three different automated teller machines inside King Soopers locations.

According to the Denver Post, 1st Bank found skimming devices on the ATMs inside 3495 S. University Blvd. in Englewood, 1155 E. Ninth Avenue in Denver, and 1650 30th Street in Boulder.

1st Bank told 7NEWS it issued new cards to hundreds of users, and the old cards will no longer work starting Tuesday.

ATM thieves typically use two skimming devices: one to read the magnetic strip on your card and another to capture your PIN as you type it in.

Experts tell customers to cover your hand while you type in your PIN. They add that it's better to use credit cards at gas stations, for example, as debit card users are the most at risk.

