A cyber-attack on USPS computer systems may have compromised the personal information of around 800,000 employees - sources say that the attack most likely originated in China.

Personal data of 800,000 USPS employees exposed in cyber-attack

The FBI and other federal agencies are investigating the cyber-attack and fear that employees' names, dates of birth, Social Security numbers, addresses, emergency contacts as well as other information may have obtained in the breach.

The agency said there is “no evidence” any customer credit card information was exposed, but the attack also compromised some call center data and may have swept up names, addresses telephone numbers and email addresses of people who provided that information between January and August this year.



The source told ABC News the attack is suspected to be the work of state actors in China, but said today’s disclosure by the USPS was unrelated to President Obama’s current visit there.

“It’s an unfortunate fact of life these days that every organization connected to the Internet is a constant target for cyber intrusion activity. The United States Postal Service is no different. Fortunately, we have seen no evidence of malicious use of the compromised data and we are taking steps to help our employees protect against any potential misuse of their data," Postmaster General Patrick Donahoe said. "As a result of this incident we have significantly strengthened our systems against future attacks. We take such threats seriously and regularly take action to protect our networks, our customers’ data and our employees’ information."