Is China Behind the Massive Data Theft of 4 Million U.S. Officials?

The US federal agency has notified 4 million current and former government employees of compromised private data, including birth dates, credit card data, banking records, security clearance information, and background checks dating back three decades, in one of the largest known breaches of information ever on federal workers. Hackers, believed to be based in China, managed to break into US government computer systems in the Office of Personnel Management (OPM)