Scammers are at it again. Kentucky police officers discovered credit card skimmers in a Fort Wright Walmart. The skimmers had been in place for up to a week, WLWT Cincinnati reported.

Walmart employees discovered the skimmer on May 18, and officials believe two men installed the information-stealing technology on May 11. Officials believe that anywhere from 500 to 1,000 cards were skimmed, according to WCPO
A Central Park, Virginia, Walmart also reported skimmers on at least one of their credit card machines early last month, reported. 

As reported by WLWT Cincinnati, a Walmart spokesperson released a statement following the discovery, "First and foremost, we have zero tolerance for any crime against our customers, our associates or our company. As soon as we heard about the possible fraudulent activity in these stores, we took action to protect our customers. We are working with law enforcement authorities to investigate this activity and are taking additional steps to ensure that our customers' transactions are safe, including increasing store inspections." 

Skimming devices are easy to overlook, especially if you aren't looking for them. But 4NBC Washington offers a few tips on how you can keep your personal information safe from scammers using these devices:

Keep an Eye Out
Look for anything bulky or unnatural looking. Run your hand over the front and back of the credit card slot. If you feel anything loose, it could be a skimmer (most skimmers are temporarily attached). 

Look for anything that could have a small hole for a camera. The scammers are probably trying to get your pin, too. Note: Most ATMs have security cameras. The cameras you want to look for may not be as easy to spot. 

Don't forget the keypad. Some scammers use an attachment over the keypad to record your pin electronically. 

Keep It Covered
Use your hand to shield your pin. Be wary of anyone standing too close as you complete your transaction. Do NOT write down your pin on your card. Choose a number you can remember.

Pay Attention
Watch for people hanging out next to the ATM and try to choose one with security cameras or that are located inside a building. Gas stations are also popular targets, so double-check before you swipe your card at the pump. 

Check Your Statements Regularly
Check your bank and/or credit card statements at least once per month. The faster you catch a fraudulent charge, the easier it is to repair the damage. 

Have you ever been a victim of credit card skimming? Share your experience in the comments below.