A group of hackers that broke into the Senate's public website earlier this week did it again Wednesday and claimed to have attacked the CIA's server as well.
The group, which goes by the name Lulz Security, announced its attack on cia.gov through Twitter. The CIA site appeared to be down for at least a few minutes Wednesday.
"We are looking into reports the service is down," a CIA spokesman told Fox News.
The hackers accessed the Senate website but didn't obtain any sensitive information, a Senate security spokeswoman said.
"They're getting nothing, but the attacks continue," Martina Bradford, the deputy Senate sergeant at arms told Reuters. "We've been able to stay ahead of the hackers and keep them out of the main Senate network."
The group also has claimed credit for hacking into the systems of Sony and Nintendo and for defacing the PBS website after the public TV broadcaster aired a documentary seen as critical of WikiLeaks founder Julian Assange.
Lulz is a reference to Internet-speak for "laugh out loud."
On Monday, Lulz posted on its website an email that listed one of Senate Sergeant-At-Arms Terry Gainer's staffers as the administrator.
"We don't like the U.S. government very much," the website wrote atop the file. "Their sites aren't very secure.
"In an attempt to help them fix their issues ... this is a small, just-for-kicks release of some internal data from Senate.gov," the site added. "Is this an act of war, gentlemen? Problem?"
The Associated Press contributed to this report.