Iraqi insurgents have hacked into the U.S. military's predator drones.
A senior defense official says militants could see live video feeds, but there's no evidence insurgents were able to take control of any of the unmanned aircrafts or vehicles.
They were able to hack into the video feeds using a $25 program that can be bought off the Internet.
The video feeds can provide insurgents with critical information about what the military may be targeting, including buildings, roads and other facilities.
The top U.S. military officer said recent computer hacking of information from U.S. drones caused no significant military damage.
Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, confirmed that hackers obtained data from drones flying over Iraq.
Mullen said he is very concerned about the issue of hacking and cybersecurity in general.
Insurgents in Iraq and Afghanistan have intercepted live video feeds from Predator drones.
Defense officials say the vulnerability caused by the recent drone incidents has been fixed.