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A viral video shows an illegal skimming overlay on a card reader at a 7-Eleven store on Shaw Avenue in Fresno, California.

The skimming device was discovered by Twitter user Joseph Harris who uploaded the video online. "Be careful, y'all," Harris says in the video as he lifts the illegal device from a card reader.

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A skimmer is designed to capture credit/debit card information and PIN numbers at bank ATMs, department stores, gas stations and convenience stores.

Sgt. Martin VanOverbeek with the Fresno Police Department's Financial Crimes Unit says some skimming devices "have the ability to store the info and connect via Bluetooth while parked outside to download the skimmed card info."

He said the skimming device at the 7-Eleven is "one of the more sophisticated overlay devices out there."

Once the criminals get your card and PIN numbers, they go on shopping sprees and drain your bank account.

The 7-Eleven employees told police they did not install the device over the card reader.

Sgt. VanOverbeek believes them:

"Despite some of the negative comments on the business/employees, it is highly unlikely they knew the device was present," he tells Fox26 News. "What has happened in the past is the clerk is distracted by another suspect asking to see something behind the counter or in the back of the store while the overlay is installed on a functional Point Of Sale (POS) device by a second suspect."

He said it only takes seconds to install the devices when employees aren't looking. Later, they return to the store to remove the device and collect the data on it.

Twitter users offered tips on how to detect a skimming device on a card reader. Some of the tips include tapping the device to see if it sounds like cheap plastic. And feel around the card reader for loose parts.

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The national average gas price is holding steady at $4.32 per gallon. However, the West Coast has surpassed $7 a gallon at the pumps.

In Washington state, police warn motorists that criminals are using power tools to drill holes in tanks to steal gas. Car owners are left with huge repair bills.

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Now police cross the country are seeing a different type of gas theft. Rather than steal gas from cars, some thieves are going straight to the source.

According to ABC13 News, thieves use trap doors under vehicles to steal as much as 360 gallons per day from gas stations.

The manager of one gas station in Houston noticed he was losing hundreds of gallons of gas per day. He reviewed his surveillance video and observed an SUV parked over the underground gas tank cover.

The robbers then unlock the cover and vacuum the gas into containers inside the SUV.

The manager told ABC13 the thieves returned three days in a row. On the 4th day he chased them away.

Cases of felony theft from gas stations are occurring all around the country, including Georgia, Virginia and California.

Armored Car Robbery

Atlanta police and the FBI suspect that a brazen midday armored car robbery in Atlanta might be an inside job.

The robbery occurred at a BP gas station on Cascade road near 285 shortly after 1 p.m. Tuesday. An unarmed man approached the driver as he left the gas station convenience store. After a brief scuffle, the man snatched a bag of money from the driver and fled on foot, Fulton County police spokeswoman Cpl. Kay Lester told the Atlanta Journal Constitution.

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