Computers Hacked

WASHINGTON (CNN) -- The FBI confirmed Tuesday the accuracy of a New York Times report that software on routers, computers that control the Internet, were compromised last year by a hacker who claimed that he had infiltrated systems serving U.S. military installations, research laboratories, and NASA.

The Times reported, and the FBI confirmed, that the focus of the investigation is a youth in Uppsala, Sweden, who has been charged as a juvenile.

The FBI said it is unclear to U.S. authorities what, if anything, can be done to prosecute the youth for violating U.S. laws.

The Times reported that the youth did not devise a new kind of attack but cleverly organized computers, automating the theft of computer log-ins and passwords.

The Times reported that the attacks were detected by workers at research labs who saw that software on Cisco computer routers, part of the backbone of the Internet, had been compromised.

In May 2004, a portion of Cisco's Internetworking Operating System (IOS) code was illegally copied and posted on the Internet.

"Cisco enlisted the help of many law enforcement agencies after the incident which occurred prior to May 15, 2004," the company said in a statement posted on its Web site.

"We are aware that a person has been detained in Sweden related to the IOS source code theft and are encouraged by this action," the statement said.

After the May breach, Cisco said it believed that the publication of the information did not create an increased risk to its customers.

'Stakkato'

The Times also reported that a California researcher got taunting messages from the hacker, who called himself "Stakkato," claiming to have infiltrated computer systems at the Patuxent River