WASHINGTON (CNN) — Hackers recently broke into a U.S. Postal Service computer system and stole personal data, including social security numbers, for 750,000 employees and retirees, a U.S. official familiar with the breach told CNN on Monday.
The breach also compromised the data of 2.9 million postal service customers, the official said.
The Postal Service acknowledged the breach in a statement Monday but didn’t provide details.
A USPS statement said: “The Postal Service has recently learned of a cyber-security intrusion into some of our information systems. We began investigating this incident as soon as we learned of it, and we are cooperating with the investigation, which is ongoing. The investigation is being led by the Federal Bureau of Investigation and joined by other federal and postal investigatory agencies. The intrusion is limited in scope and all operations of the Postal Service are functioning normally.”
The personal identifying information of the 750,000 employees and retirees including birthdates, addresses and employment codes used in the Postal Service’s payroll systems, the official briefed on the matter said.
The USPS is notifying employees and retirees Monday and will pay for credit monitoring for those affected, the official said.
Postal Service spokesman David Partenheimer also says the customers at local post offices or those using its website, usps.com, were not affected. However, people who used its call center may have had telephone numbers, email addresses and other information compromised.
The agency isn’t recommending that those customers take any action.