Late yesterday Landry's, Inc., an American restaurant group that owns and operates over 500 restaurants across the country — including chains like Rainforest Cafe, Morton's Steakhouse, and Bubba Gump Shrimp Company — confirmed its restaurants had been victims of a network-wide credit card breach.

According to Krebs on Security, banking industry sources began reporting fraud patterns on cards used at Landry's restaurants last week. The Houston, Texas-based company was slow to confirm the rumors, but says in a release, "We immediately began an investigation after receiving these reports and have engaged a leading cybersecurity company to investigate this matter. We are also working with our processor and payment card networks."

It is not known at this time which of Landry's restaurants have been affected. Landry's owns several major restaurant chains, including Claim Jumper, Mastro's Restaurants, and McCormick & Schmick's; their full list of restaurants is below:

Aquarium Restaurant

Babin's Seafood House

Big Fish Seafood Bistro

The Boathouse in Canada

Brenner's Steakhouse

Brenner's on the Bayou

Bubba Gump Shrimp Company

Cadillac Bar

Charley's Crab

Chart House

Claim Jumper

The Crab House

Fish Tales

Fisherman's Wharf Seafood Grill

The Flying Dutchman Restaurant & Oyster Bar

Gandy Dancer

Grand Concourse

Grotto

Harlow's Food & Fun

La Griglia

Landry's Seafood

Mai Tai Bar

Mastro's Restaurants

McCormick & Schmick's

Meriwether's

Morton's The Steakhouse

The Oceanaire Seafood Room

Peohe's

Rainforest Cafe

Red Sushi

River Crab

Rusty Pelican

Saltgrass Steak House

Simms Steakhouse

T-Rex Cafe

Trevi

Vic & Anthony's Steakhouse

Willie G's Seafood & Steaks

Yak & Yeti

Customers who have dined at any of these restaurants between May 2015 and today should immediately check their credit card statements and report any irregularities to their credit card company. Landry's notes in their release: "Individuals that timely report unauthorized charges to the bank that issued the card are generally not responsible for such unauthorized charges. Accordingly, we encourage all consumers to follow good practices by regularly reviewing their payment card accounts and timely reporting unauthorized charges."

Landry's began installing a more sophisticated payment processing system earlier this year. Krebs suggests that the company was at risk for credit card fraud because it was slow to note its own vulnerability. This current breach began to occur prior to the new system's installation across the restaurant group. This story is developing.

Restaurants are particularly at risk for credit card breaches because of the many different ways a restaurant can process a credit card transaction, the fact that credit cards leave a seated diners' sight when they pay (at least in the U.S.), and the industry is bogged down by old, clunky point of sale systems. Krebs notes that banks tracking card data stolen after use at Landry's restaurants say the fraudulent charges are occurring at big box retailers like Target and Best Buy.