Hackers stole data on Pentagon's newest fighter jet - CNN.com

"Thousands of confidential files on the U.S. military's most technologically advanced fighter aircraft have been compromised by unknown computer hackers over the past two years, according to senior defense officials."

In addition to files relating to the aircraft, hackers gained entry into the Air Force's air traffic control systems, according to the officials. Once they got in, the Internet hackers were able to see such information as the locations of U.S. military aircraft in flight.

Last month, a Pentagon annual report to Congress about China's military power said China has been making continued progress in developing cyber-warfare techniques.

The report noted that U.S. government computers were the target of "intrusions that appear to have originated" in China, although they were not confirmed to be from the Chinese military.