An Anonymous-affiliated Twitter account is promoting conspiracy theories about the attack on French satirical magazine Charlie Hebdo, despite a promise from other Anonymous hackers to avenge the attack.

TheAnonMessage linked to a video showing the death of policeman Ahmed Merabet, alongside claims that elements such as the editing of the video indicated misreporting in the mainstream press.

"This is exactly what we’ve been trying to say," TheAnonMessage said.

The tweets contrast with a video posted to Anonymous Belgium over the weekend "declaring war" against Islamic terrorists for the attack, leading to what has been dubbed Operation Charlie Hebdo, or #OpCharlieHebdo.

Though the comments were widely reported by the mainstream press, the Twitter account OpCharlieHebdo dissociated itself from the Anonymous Belgium release, instead promoting a YouTube video on the Anonymous France channel that carried a similar message.

"It’s obvious that some people don’t want, in a free world, this sacrosanct right to express in any way one’s opinions," OpCharlieHebdo said in a statement.

"Anonymous has always fought for the freedom of speech, and will never let this right besmirched by obscurantism and mysticism."

Tweets form the group’s account also claimed that at least one jihadist website had already been taken offline.

Around the same time YourAnonNews, a Twitter account with 1.45m followers which is among the largest Anonymous voices, promoted a report from Mashable that drew attention to the free speech records of many Western leaders attending a march in Paris on Sunday.

Anonymous has a decentralised and non-hierarchical structure allowing anybody to assume the mantle of an "anon" as a means of online political protest known as "hacktivism".