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.”