The satirical hacker group LulzSec (Lulz Security) brags on their Twitter account of an attack against the U.S. intelligence service CIA. Several U.S. media sites confirms that were unavailable in periods Wednesday night, and may have been subject to a denial of service attack.

Lulz admit to the same kind of attacks against gaming magazine The Escapist, online game Eve Online and the League of Legends. Lulz also claimed responsibility for attacks against Sony Pictures and the U.S. Senate, earlier this spring.