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"CIA Tango down," a member of Anonymous said on @YourAnonNews, a Twitter feed used by the group. "Tango down" is an expression used by the US Special Forces when they have eliminated an enemy.
Attempts to access the CIA website at cia.gov were unsuccessful.
More than two hours after the initial attack on the site attempts by AFP to reach cia.gov were met with a message saying the Web page was not available.
Asked about the apparent website outage, a CIA spokeswoman said: "We are looking into these reports."
Members of Anonymous also claimed Friday to have hacked the website of Camimex, the Mexican chamber of mines, and posted emails taken from the site online.
Like CIA.gov, the camimex.org.mx site was unavailable on Friday.
Anonymous last month briefly knocked the websites of the US Justice Department and the Federal Bureau of Investigation offline.
Those attacks were in retaliation for the US shutdown of file-sharing site Megaupload.
There was no immediate explanation from Anonymous for the targeting of the CIA site.
In June, an Anonymous-affiliated group, Lulz Security, also temporarily disabled the CIA website.
Most Anonymous cyberattacks are distributed denial of service attacks in which a large number of computers are commanded to simultaneously visit a website, overwhelming its servers.
Classic false flag "Oh we have been hit so Anonymous (aka CIA) cant possibly be anything to do with us!"