The National Security Agency says an internal system error caused its website to go down for several hours Friday during a scheduled update.
There had been speculation on the Internet that the online site had been hit with a denial-of-service attack, but the agency said that was not true.
The NSA said the problem would be resolved...
http://www.foxnews.com/tech/2013/10/26/nsa-website-down-hacker-group-appears-to-take-credit-on-twitter/