As of 4 p.m. Eastern on Friday afternoon, the Central Intelligence Agency's website is down... and hacktivist group Anonymous are allegedly responsible. Visitors to the website are currently greeted by an error message.
The @youranonnews  Twitter feed, which is connected to Anonymous, posted a message at 3:25pm which appears to claim responsibility:
CIA TANGO DOWN: https://www.cia.gov/ #Anonymous (via@RT_America)
“Tango down” is a term used by United States Special Forces after they have killed a terrorist. The Tweet directs users to a news story  from RT/Russia Today, a Russian government-operated English-language television cable news network. RT's story notes the existence of Anonymous' FuckFBIFriday campaign last week, when the organzation leaked a series of infamous conference calls between the FBI and Scotland Yard.
For American audiences, RT is best known as the television home of WikiLeaks guru Julian Assange's upcoming television show .
Although @youranonnews posted a link to RT's article, other Anonymous-affiliated Twitter feeds such as @anonymousirc  and @anonymouspress  have not made any claims of responsibility for the attack.