After targeting the U.K. the hacker collective LulzSec yesterday claimed responsibility for successful cyber attacks against two of the Brazilian Government's websites.

The first tweet appeared on the seperate LulzSecBrazil Twitter page and was subsequently retweeted by the main LulzSec feed. The tweet read, TANGO DOWN & LulzSecBrazil.

The tweet was quickly followed by, Our Brazilian unit is making progress. Well done @LulzSecBrazil, brothers!

Both the and sites were still down at the time this article was written.

LulzSec is yet to release further details about the attack. Analysts have already speculated that the sites were taken down using distributed denial of service attacks.

DDoS attacks work by flooding a network or system with requests to the point that it overloads and shuts down. The technique has been used in many of both LulzSec and Anonymous' previous attacks.

The group commented on its use of the technique tweeting, DDoS is of course our least powerful and most abundant ammunition. Government hacking is taking place right now behind the scenes. #AntiSec.

The attacks have been credited as being a part if LulzSec and Anonymous' ongoing campaign against the world's banks and governments.

Codenamed Project Anti-Security the group has already claimed responsibility for a similar attack on the U.K.'s Serious Organised Crimes Agency's website.

Since the campaign began a 19-year-old man named Ryan Cleary has been arrested for involvement in the attacks. LulzSec has since openly denied Cleary's membership.