Hundreds of thousands of Arby's customers, including residents of Maine and New Hampshire, may have had their credit and debit card information stolen.

The restaurant has reported that malware was installed in payment systems and cash registers at hundreds of Arby’s locations in the U.S.

Officials with the fast food restaurant chain say they were made aware of the security breach in mid-January. At the request of the FBI, the company did not immediately go public with the information.

There are more than 3,330 Arby's locations in the U.S., including in Auburn, Augusta, Presque Isle, South Portland, Topsham and Manchester and Nashua, New Hampshire.

In a Facebook post on Friday, the Auburn Police Department urged customers from the two states to closely monitor their payment card account statements for any unauthorized activity.

Officials say the data breach may have involved more than 355,000 credit and debit cards.

According to the restaurant, the breach may have affected hundreds of the chain’s locations but no franchises were affected.