Law enforcement computers were struck by a mystery computer virus Thursday, forcing the FBI and the U.S. Marshals to shut down part of their networks as a precaution.

The U.S. Marshals confirmed it disconnected from the Justice Department’s computers as a protective measure after being hit by the virus; an FBI official said only that that agency was experiencing similar issues and was working on the problem.

“We too are evaluating a network issue on our external, unclassified network that’s affecting several government agencies,” said FBI spokesman Mike Kortan. He did not elaborate or identify the other agencies.

Marshals spokeswoman Nikki Credic said the agency’s computer problem began Thursday morning. The FBI began experiencing similar problems earlier.

“At no time was data compromised,” said Credic. The type of virus and its origin were not determined.

You won’t get an email saying Pope Benedict added you as a friend and you can’t “poke” him or write on his wall, but the Vatican is still keen to use the networking site Facebook to woo young people back to church.

A new Vatican website, www.pope2you.net, has gone live, offering an application called “The pope meets you on Facebook,” and another allowing the faithful to see the Pope’s speeches and messages on their iPhones or iPods.