TRENTON — Whole Foods becomes the latest New Jersey retailer to warn its customers of a possible credit breach.

The chain said the breach affects only customers of its in-store restaurants and taprooms, which use a different point-of-sale system than the main store checkout.

Of the 17 Whole Food locations in New Jersey, three have restaurants.

Clark Bar inside Whole Foods store in Clark (Dan Zarrow, Townsquare Media NJ)

The Clark location has a barbecue-themed restaurant called the Clark Bar. The Milburn location also has a barbecue restaurant, and the Metuchen store has a Mexican restaurant.

Whole Foods said it has launched an investigation, hired a cyber security forensics firm and contacted law enforcement.

The chain's payment systems do not connect to those of new owner Amazon.

A credit card breach was announced last week by Sonic Drive In involving 5 million credit and debit card numbers used at Sonic’s 3,600 locations nationwide. The numbers were then sold on the black market to be used fraudulently.

In September, credit monitoring company Equifax announced a high-tech breach that exposed Social Security numbers and other sensitive information about 143 million Americans.

Earlier this month, credit monitoring company Equifax announced a high-tech breach that exposed Social Security numbers and other sensitive information about 143 million Americans.

Contact reporter Dan Alexander at dan.alexander@townsquaremedia.com.

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