The information that was illegally accessed includes credit card numbers, AT&T said in a statement. The cyberattack affects about 19,000 customers who purchased equipment for high-speed DSL Internet connections through AT&T's Web site, the company said.
"We deeply regret this incident," Priscilla Hill-Ardoin, chief privacy officer for AT&T, said in the statement. "We will work closely with law enforcement to bring these data thieves to account."
The break-in occurred over the weekend and was discovered within hours, after which the online store was shut down, AT&T said. The telecommunications company quickly notified credit card companies and is in the process of contacting the affected customers via e-mail, phone and letter, it said.
The incident is the latest in a long compiled by the Privacy Rights Clearinghouse.. Since early last year, more than 90 million personal records have been exposed in dozens of incidents, according to information
AT&T is offering to pay for credit monitoring services for customers whose accounts have been impacted because they could be. The company also has made available a toll-free number to affected customers to call for more information.