LulzSec, the Internet group that is very vocal about its hacking escapades, seems to have gone to war with members of 4Chan, an Internet message board, and Anonymous, the activist hacker group whose members come from 4Chan.

A poster making the rounds on the Internet appears to have been created by Anonymous or members of 4Chan. It calls for people to identify the members of LulzSec or alert the FBI if they know who they are. The poster contains graphic and offensive language.

On Tuesday, LulzSec tweeted: "Challenged accepted, losers :D," acknowledging the group was aware that members of 4Chan were after it.

A day later LulzSec tweeted a message implying it had launched a denial of service attack on 4Chan's Web hosting company in an effort to take it down.

"Sorry , your LOIC hive is no match for our phone redirect hive. A certain hosting company just got 1000+ calls," LulzSec tweeted.

Anonymous says it has an activist agenda, most recently hacking websites of the Turkish government in support of freedom of speech. It didn't seem bothered by LulzSec's attacks on PBS, Fox or Sony. But when LulzSec appeared to have tried to crash the Web servers for three popular Internet games -- League of Legends, Minecraft and EVE Online -- 4Chan and Anonymous members seemed to have become frustrated with their hacker counterparts.

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--Salvador Rodriguez

Twitter.com/sal19

Image: A screen shot of part of a poster calling for people to identify members of LulzSec.