The U.S. Department of Energy said Monday that 
personal information about several hundred employees and contractors was
 stolen in a mid-January hack, but that no classified information was 
compromised.
    
The agency is working with federal law enforcement and other 
agencies "to promptly gather detailed information on the nature and 
scope of the incident and assess the potential impacts to DOE staff and 
contractors," according to an internal DOE letter that was circulated 
Friday and released by the agency on Monday.
"As individual affected employees are identified, they will be 
notified and offered assistance on steps they can take to protect 
themselves from potential identity theft," the letter said. "Once the 
full nature and extent of this incident is known, the department will 
implement a full remediation plan."
The DOE, which has a budget of more than US$20 billion, is 
responsible for a wide range of policies governing U.S. energy 
production and use, as well as overseeing the safety and reliability of 
the nation's nuclear weapons arsenal.
The attacks follow a wave of cyberattacks that have struck 
prominent corporations and governments around the world. Last week, The 
New York Times and The Wall Street Journal said hackers infiltrated their IT systems in an apparent attempt to monitor reporting on China.
In recent years, companies including Google, RSA and Symantec
 have also been attacked, illustrating that even companies with 
high-level computer security expertise face challenges in defending 
their networks.
The DOE said it is "leading an aggressive effort to reduce the likelihood of these events occurring again."
The agency has a Joint Cybersecurity Coordination Center that 
will be "increasing monitoring across all of the department's networks 
and deploying specialized defense tools to protect sensitive assets."
Also studying the attack is the DOE's Cybersecurity Team, the 
Inspector General's office, and the Office of Health, Safety and 
Security, the DOE said.








