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. . .