Computer security experts are urging people to protect their PCs from a new virus that has attacked critical industrial infrastructure.
The Stuxnet virus infects PCs via USB flash drives and disables them or gives attackers access to them. It mainly attacks German-made control software used at power plants and water treatment facilities. It has also been found on 63 personal computers in Japan.
Researcher Kaoru Hayashi at computer security firm Symantec says computer users should exercise caution when using USB flash drives.