tranquilidad writes: According to a story in the Washington Post, China hacked into the computer system of the United States' Office of Personnel Management last December. This was the second major intrusion in less than a year. Personally identifiable information of approximately 4 million individuals may have been compromised. The compromised information was related to security clearances and employee records. "The FBI is working with our interagency partners to investigate this matter. We take all potential threats to public and private sector systems seriously, and will continue to investigate and hold accountable those who pose a threat in cyberspace," an FBI spokesman said.