The radical Islamic Web site Revolutionmuslim.com is going after the creators of the TV cartoon series "South Park" after an episode last week included an image of the Prophet Mohammed in disguise.

Revolutionmuslim.com, based in New York, was the subject of a CNN investigation last year for its radical rhetoric supporting “jihad” against the West and praising al Qaeda leader Osama bin Laden. Its organizers insist they act within the law and seek to protect Islam.

On Sunday, Revolutionmuslim.com posted an entry that included a warning to South Park creators Trey Parker and Matt Stone that they risk violent retribution – after the 200th episode last week included a satirical discussion about whether an image of the prophet could be shown. In the end, he is portrayed disguised in a bear suit.

The posting on Revolutionmuslim.com says: “We have to warn Matt and Trey that what they are doing is stupid and they will probably wind up like Theo Van Gogh for airing this show. This is not a threat, but a warning of the reality of what will likely happen to them.”

Theo van Gogh was a Dutch filmmaker who was murdered by an Islamic extremist in 2004 after making a short documentary on violence against women in some Islamic societies. The posting on Revolutionmuslim.com features a graphic photograph of Van Gogh with his throat cut and a dagger in his chest.

The entry on Revolutionmuslim.com goes on to advise readers:

“You can contact them [the makers of South Park], or pay Comedy Central or their own company a visit at these addresses …” before listing Comedy Central’s New York address, and the Los Angeles, California, address of Parker and Sloane’s production company.

Contacted by CNN, the author of the post, Abu Talhah al Amrikee, said that providing the addresses was not intended as a threat to the creators of South Park but to give people the opportunity to protest.

Over still photographs of Parker, Stone, van Gogh and others, the Web site runs audio of a sermon by the radical U.S.-born preacher Anwar al-Awlaki, who is now in hiding in Yemen. The sermon, recorded some time ago, talks about assassinating those who have “defamed” the Prophet Mohammed – citing one religious authority as saying “Harming Allah and his messenger is a reason to encourage Muslims to kill whoever does that.” U.S. officials say al-Awlaki is on a list of al Qaeda leaders targeted for capture or assassination.

The clip ends with a warning on a graphic directed at Parker and Stone, saying “The Dust Will Never Settle Down.”

Al Amrikee said the purpose of including the al-Awlaki sermon in his posting was to remind Muslims that insulting the prophet is a severe offense for which the punishment in Islam is death. He said RevolutionMuslim may hold protests about the show.

Calls to Comedy Central were not returned.