McALLEN, Tex. — Account information stolen during the Target security breach is now being divided up and sold off regionally, a South Texas police chief said on Monday following the arrest of two Mexican citizens who the authorities say arrived at the border with 96 fraudulent credit cards.

Chief Victor Rodriguez of McAllen said the suspects, Mary Carmen Garcia, 27, and Daniel Guardiola Dominguez, 28, both of Monterrey, Mexico, had cards containing the account information of South Texas residents. Chief Rodriguez said the pair used the cards to buy tens of thousands of dollars’ worth of merchandise a week earlier at national retailers in the area like Best Buy and Toys “R” Us.

“They’re obviously selling the data sets by region,” he said.

Ms. Garcia and Mr. Guardiola were arrested Sunday re-entering the United States and were held on state fraud charges.

Target said last week that it had stopped more than a dozen operations that sought to swindle breach victims by way of email, phone calls and text messages.