The attack — so far cosigned by two of the largest Anon Twitter accounts with a combined 600,000 followers — would fall in line with the group's increasingly ambitious hit list of large corporate interests and powerful law enforcers. And it is, after all, #FuckFBIFriday, the end of the week occasion Anon often uses for hitting governmental agencies. Still, it would take a level of coordination and effort to knock off a federal site that should have revealed itself by now.
Update: Despite apparent confirmation via Twitter, nobody in Anon's IRC channels seem to have any idea what's going on.
Update 2: CIA.gov is still down, and no satisfactory explanation. One Anon told me the site is being DDoSed by a group of anti-pedophile hackers who are using seized kiddy porn servers as a botnet against the CIA. That'd be something!
Update 3: CIA.gov has now been down for well over an hour.