MILFORD – Several New Hampshire Wendy’s restaurants, including the one in Milford, are on the list of the franchises that were hacked, according to the fast-food company.

More than 1,000 of the chain’s 5,700 restaurants were targeted by data thieves nationwide, with an unspecified number of debit and credit card users affected. Malware, or malicious software, was installed at the loca­tions for the point-of-sale systems, according to re­ports.

Local restaurants af­fected by the hack in­clude the Whitney Street site in Merrimack and the Elm Street location in Milford between Jan. 13 and June 8 and four res­taurants in Nashua – 46 East Hollis St., 141 Dan­iel Webster Highway, 631 Amherst St. and 14 Gusa­bel Ave – between Dec. 2 and June 8.

Wendy’s has urged cus­tomers to check bank ac­counts associated with debit and credit cards that were used for pur­chases.