READ MORE: Here's how you can detect a card skimmer on a gas pump
According to the Friendswood Police Department, the skimmers were found at a gas station located at 1651 W. Parkwood Ave.
A customer who frequently visits the gas station alerted employees of fraudulent activity on their credit card.
When technicians came to service the pumps on Monday, they found three skimmers installed on the pumps.
Police said those skimmers could have been in place since Wednesday, Aug. 19.
The police department is asking anyone who may have used a debit or credit card at the gas pump at the gas station to be aware of any potential fraudulent activity.