Patty Pontello, a spokeswoman for the U.S. Attorney in Sacramento, said the warrant was sealed and she did not know what the charges were.
Lamo has acknowledged involvement in some dramatic computer break-ins over the past several years at large corporations such as WorldCom and ExciteAtHome.
The Times called the FBI after Lamo browsed sensitive data on its computers, including Social Security numbers for celebrities and government officials who are among the 3,000 contributors to its op-ed page. Lamo also acknowledged changing the text of at least one news story on Yahoo's website in September 2001.
The New York investigation became public a year ago, when a federal prosecutor tried unsuccessfully to subpoena an MSNBC reporter's notes, e-mails and other information about conversations with Lamo.
Lamo frequently uses public computers at copy stores for his hacking activities as he travels the nation. He has offered to work for free with his hacking victims after each break-in to improve the security of their networks.
http://www.wired.com/news/politics/0,1283,60365,00.html