MADISON, Wis. (WMTV)---Two men from California were arrested Friday morning at a local hotel as part of an ongoing fraud investigation into skimmers that were placed on local gas pumps.

According to the Madison Police department, a search of the men’s, 46-year-old Arsen Piloyan and 49-year-old Wafig M. Jebarah, hotel room and rental van led to the discovery of evidence.

Police said during a recent investigation they were able to identify one suspect through numerous surveillance images recorded at local businesses where fraudulent cars were use late last month.

Friday morning police said they received information that the suspect was back in Madison. He was arrested with a previously unidentified suspect.

11 skimmers have been found on Madison gas pumps with the most recent coming on Thursday when one was found at a BP station on Commercial Ave. Detectives believe the men may have placed skimmers on pumps that have yet to be discovered. They urge business owners to inspect their pumps immediately.

The skimmers are being turned over to the FBI for further investigation.

A new Madison ordinance will go into effect on January 1 which requires all gas pump owners to install new locks on pumps.

Two card skimmers were found in two days this week and the Department of Trade and Consumer protection says they have found more than two dozen in the past few months.

Officials say since late summer they have seen an increase in card skimmers at gas pumps. The skimmers are used to collect credit card information from drivers who pay for their gas at the pump.

Frank Frassetto from the Department of Trade and Consumer Protection says this crime is not isolated to large cities. He say they've seen credit card skimmers pop up at busy gas stations along interstates.

"Just because you're going to a mom and pop shop doesn't necessarily mean everything is okay. That's the important part. Even though we've found these high traffic areas anyone could be susceptible. Any dispenser could be susceptible to being tampered with," Frassetto says.

Here are some things you can look for to protect yourself:

First, check for an "inspected" sticker on the side of a gas pump, near the lock, where the pump opens. Many gas stations have been putting these tamper stickers on their pumps to help monitor if any pumps have been tampered with.

Frassetto says many of the skimmers they've been finding are located on the inside of the gas pump. He says if you see a sticker that has been scratched at or ripped, it's an indication that the pump may have been tampered with. He says if you see a damaged sticker, do not insert your card and tell gas station employees.

Second, check to make sure the card reader on the pump looks normal, isn't loose or extra bulky. Check to make sure it looks like card readers at nearby pumps. External card skimmers are less common but Frassetto says looking out for them can help you avoid getting your information stolen.

Frassetto says it's also a good idea to avoid the pump furthest away from the door of the gas station. He says often times when information thieves are installing the skimmers, they do so at the pump furthest from the attendant in an effort to avoid getting caught.

Lastly, Frassetto says the best way to avoid getting your card skimmed while getting gas is to just pay inside. Card readers inside gas stations are no susceptible to criminal tampering.