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updated 6/15/2011 6:49:11 PM ET 2011-06-15T22:49:11

The LulzSec hackers have struck again — this time against the U.S. Senate.

"We don't like the US government very much. Their boats are weak, their lulz are low, and their sites aren't very secure. In an attempt to help them fix their issues, we've decided to donate additional lulz in the form of owning them some more!" the group wrote in a letter on its website, www.lulzsecurity.com.

The leak includes the usernames and IP addresses of two people holding Senate.gov email addresses.

In the letter, LulzSec boasts of its exploits, and takes a defensive stance against the U.S. government.

"This is a small, just-for-kicks release of some internal data from Senate.gov — is this an act of war, gentleman? Problem?"

Mentioning the "act of war" could be LulzSec's retaliation against President Obama and the Pentagon for recently declaring that online attacks may be considered acts of war that can be responded to with traditional military force.

It's been a busy few weeks of hacktvism for LulzSec.

On June 6, LulzSec compromised Nintendo's U.S. servers. That hack was followed the June 3 attack on InfraGard, an Atlanta-based company that provides IT services to the FBI.

On June 9, LulzSec alerted the United Kingdom's National Health Service to security flaws in its network that left it vulnerable to attack. (LulzSec did not expose any data in this case.)

And the Senate.gov hack came packaged with LulzSec's hack of Bethesda Softworks and ZeniMax media, the companies behind the popular video games " Fallout, "DOOM" and "Brink."

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