Report Lists Hacked US Weapon Designs

DoD report: More than two dozen major weapon systems compromised.
1:56 | 05/28/13

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Transcript for Report Lists Hacked US Weapon Designs
What's being called a staggering security breach. A report that Chinese hackers gained access to the blueprints. Of some of the nation's most advanced weapons they can -- the designs for their use and the Chinese could possibly cause problems. With the US weapons. ABC's chief investigative correspondent Brian Ross on this new threat. American officials told ABC news today that at least 29 of the country's most critical weapon systems. Had been compromised by Chinese hackers. From the navy's aegis system to knock out enemy ballistic missile. To the state of the art F 35 jet fighters to the most advanced marine combat field which. Chinese may be able to discover vulnerabilities. And those weapons systems that would make them easier to attack and easier to copy. This is the one point four trillion dollar USF 35. And this is the remarkably similar Chinese. US global hawk high altitude drone. And then almost look -- Chinese version. It closes the -- happen if that's not a gap we wanted to close the list of compromise systems first reported by the Washington Post was part of a pentagon study that said. The US sustained a staggering losses this is probably the -- -- national security. Immediate challenge facing the United States. And although -- officials say a huge team of Chinese military hackers. Operating out of this building in Shanghai continues to refine and accelerate its efforts to -- off the US military designs. The Pentagon spokesman said today there's been no erosion of US capabilities still what has happened is serious enough to make some analysts wonder if worst case. Chinese hackers would be able to shut down the ability of the US military to defend or to counter -- Diane in -- time of war and our Brian Ross thank you.

This transcript has been automatically generated and may not be 100% accurate.

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