Washington Post 
Jan 27, 2013
Federal investigators looking into disclosures of classified information about a cyberoperation that targeted Iran’s nuclear program have increased pressure on current and former senior government officials suspected of involvement, according to people familiar with the investigation.
The inquiry, which was started by Attorney General Eric H. Holder Jr. last June , is examining leaks about a computer virus developed jointly by the United States and Israel that damaged nuclear centrifuges at Iran’s primary uranium enrichment plant. The U.S. code name for the operation was Olympic Games, but the wider world knew the mysterious computer worm as Stuxnet.
Prosecutors are pursuing “everybody — at pretty high levels, too,” said one person familiar with the investigation. “There are many people who’ve been contacted from different agencies.”
The FBI and prosecutors have interviewed several current and former senior government officials in connection with the disclosures, sometimes confronting them with evidence of contact with journalists, according to people familiar with the probe. Investigators, they said, have conducted extensive analysis of the e-mail accounts and phone records of current and former government officials in a search for links to journalists.