Some investigators suspect the attacks were part of a sweeping campaign to create a database on Americans that could be used to obtain commercial and government secrets.

Investigators of Anthem Inc.s data breach are pursuing evidence that points to Chinese state-sponsored hackers who are stealing personal information from health-care companies for purposes other than pure profit.

As cyber expands, so do the breaches.

The U.S. Department of Homeland Security said malware called BlackEnergy was used to access digital systems that control water treatment facilities and parts of the electrical grid.