/span/span div style="float:right;width:305px;display:inline;font-size:13px;font-weight:400;font-style:normal;line-height:16px;" img src="http://news.bbcimg.co.uk/media/images/53622000/jpg/_53622378_brazil.jpg" width="304" height="228" alt="Brazil Flag"span style="width:304px;"The attack in Brasil illustrates LulzSec's global reach/span /div div class="story-feature related narrow"Related Stories/div p class="introduction" id="story_continues_1"The websites of the Brazilian government and President have fallen victim to hacker group Lulz Security./p pIn a Twitter posting, LulzSec said "Tango Down" and linked to the two sites./p pBoth are thought to have been taken offline by distributed denial-of-service attacks (DDoS)./p pLulzSec recently signalled its intent to target the systems of governments and associated organisations around the world./p pIn the past month, it has attacked the UK's Serious Organised Crime Agency, the US Senate, Sony, and the broadcaster PBS, as well as a number of games companies./p pDDoS attacks are regarded more as malicious activity than hacking, because the sites' computer systems are not broken into./p pInstead, they are deliberately overloading with traffic, such as communication requests or so-called 'e-mail bombs'./p pThe group tweeted "Our Brazilian unit is making progress. Well done @LulzSecBrazil, brothers!" shortly after the two sites went down./p div style="float:right;width:305px;display:inline;font-size:13px;font-weight:400;font-style:normal;line-height:16px;" img src="http://news.bbcimg.co.uk/media/images/53622000/jpg/_53622376_lulz.jpg" width="304" height="304" alt="LulzSec Logo"span style="width:304px;"LulzSec has significantly increased its activity in recent months./span /divpLulzSec also commented on the case of a href="http://www.bbc.co.uk/news/technology-13859868" title="Ryan CLeary arrest"19-year-old Ryan Cleary/a who was arrested in Essex on 21 June on suspicion of hacking websites./p pThe group said that he was not part of their organisation./p pMetropolitan Police Commissioner, Sir Paul Stephenson, described Mr Cleary's arrest as "very significant"./p pAlthough he declined to discuss the details of the case, the Commissioner added: "The challenges around cyber-crime are extremely significant and deeply worrying across the gamut of cyber-crime from personal information to how a paedophile can enter a child's bedroom."/ppThis article is from the a href="http://news.bbc.co.uk" title="Link to BBC News"BBC News website/a. © British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites./p pa href="http://feedads.g.doubleclick.net/~a/v-ShJODlAGj2vWrsXf3lTUup58Y/0/da"img src="http://feedads.g.doubleclick.net/~a/v-ShJODlAGj2vWrsXf3lTUup58Y/0/di" border="0" ismap="true"/img/abr/ a href="http://feedads.g.doubleclick.net/~a/v-ShJODlAGj2vWrsXf3lTUup58Y/1/da"img src="http://feedads.g.doubleclick.net/~a/v-ShJODlAGj2vWrsXf3lTUup58Y/1/di" border="0" ismap="true"/img/a/pimg src="http://feeds.feedburner.com/~r/BbcNewsTechnologyFullFeed/~4/P-l2JCldBOI" height="1" width="1"/