A hacking cooperative that goes by Lulz Security claimed that it had added a Senate file to its list of successful, high-profile intrusions at a time when governments and corporations are on high guard for cyber intrusions.
The group has claimed credit for hacking into the systems of Sony and Nintendo and for defacing the PBS website after the public television broadcaster aired a documentary seen as critical of WikiLeaks founder Julian Assange.
Earlier 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 US 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?"