Add another 21 million to the already existing 4 million Americans who have had their personal data stolen by hackers breaking into federal computer systems. National Journal reports that once again the breach was through the Office of Personnel Management.

Of the 21.5 million records that were stolen, 19.7 million belonged to individuals who had undergone background investigations, OPM said. The remaining 1.8 million records belonged to other individuals, mostly applicants' families.

The records that were compromised include detailed, sensitive background information, such as employment history, relatives, addresses, and past drug abuse or emotional disorders. OPM said 1.1 million of the compromised files included fingerprints.

With that kind of information, stealing an identity, or 1 million identities, would be fairly simple.

According to National Journal the government is privately linking both hack attacks back to China. People who had submitted their information to the government will have credit monitoring and protection provided to them by the government but the information of those people who may have been listed as references, will not. Those people, who may not be contacted to be informed that their information has been hacked, will be on their own.