Stuxnet Computer Worm Cannot be Blocked Yet

A senior Iranian IT official acknowledged Monday that the Stuxnet computer worm is causing serious problems in Iran and that technicians have been unable to stop it so far. A flurry of stories in the West spoke of Stuxnet possibly being planted by Western intelligence agencies to destroy Iran's nuclear power generating plant at Bushehr. But Iranian officials said there was no problem with that reactor. The problem is elsewhere, they said, without detail ing where elsewhere was.