The hacker group, which goes by the name of "Lulz Security," published details online at lulzsecurity.com of a file said to have been swiped from Senate.gov.
"This is a small, just-for-kicks release of some internal data from Senate.gov -- is this an act of war, gentlemen?" Lulz Security said in a statement.
"We don`t like the US government very much," the group added. "Their sites aren`t very secure."
Lulz Security has claimed credit for a series of cyberattacks in recent weeks.
The targets have included Sony`s online operations, an FBI partner website, the website of videogame developer Bethesda Softworks and the website of the US non-profit Public Broadcasting Service.
There was no immediate reply from the Senate.gov webmaster to an inquiry from AFP about the Lulz Security claims. (*)
Editor: Kunto Wibisono
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