CNN CNN Newsroom Live December 22, 2015 07:32:00
>> reporter: investigators believe the intruders were probing. no damage was done. hacking of dam controls have long been a homeland security concern. in 2013, hackers penetrated a sensitive database of u.s. dams, maintained by the army core of ennears. asked about the breach, the department of homeland security cold cnn it has no comment on the alleged incident. >> obviously, it's fairly scary for us as a nation to imagine somebody on the other side of the world can hit a key stroke and water can start going through a dam. >> last week cnn reported on a breach at a computer company. u.s. offi...