Henri Roussel, 80, who contributed to the first issue in 1970 when the magazine was known as Hara-Kiri Hebdo, had written to editor Stéphane Charbonnier – who goes by the name “Charb” – to say of the divisive drawings: “I really hold it against you.”

Referring to the editor’s decision to print a drawing of Prophet Mohamed on the front cover in 2011, Mr Roussel – who publishes under the pen name Delfeil de Ton – wrote in this week’s French magazine Nouvel Obs: “What made him feel the need to drag the team into overdoing it?”, The Telegraph reported.

The cover of the magazine consisted of a drawing of Prophet Mohammed, which said “100 lashes of the whip if you don’t die laughing!” under a banner saying “Charia Hebdo” in reference to Sharia law. Soon afterwards, the magazine’s offices were burned down in a firebomb attack by arsonists who have not been identified.

Charlie Hebdo is extending its print run to five million copies for the “survivor’s issue” from the normal number of around 60,000. The first print run sold out in hours in France while people queued in long lines to wait their turn to buy copies.

Delfeil adds: “I believe that we are fools who took an unnecessary risk. That’s it. We think we are invulnerable. For years, decades even, it was a provocation and then one day the provocation turns against us.

“He shouldn’t have done it, but Charb did it again a year later, in September 2012.”

An issue a year after the firebomb attacks showed the Prophet in a wheelchair saying “You must not mock”. Another cartoon inside the magazine depicted him without clothes.

Brothers Cherif and Said Kouachi, and another man Amedy Coulibaly, were shot dead at the end of a three-day siege after they murdered a total of 17 people in Paris and they were reportedly heard shouting “we have avenged Prophet Mohamed!” A video purportedly from al-Qaeda in Yemen said it planned the attack.

However, the claims made by the magazine’s founder angeredCharlie Hebdo lawyer Richard Malka, who has worked for the publication for the past 22 years.

He told Mathieu Pigasse, one of the owners of Nouvel Obs andLe Monde: “Charb has not yet even been buried and Obs finds nothing better to do that to publish a polemical and venomous piece on him.

“The other day, the editor of Nouvel Obs, Matthieu Croissandeau, couldn’t shed enough tears to say he would continue the fight. I didn’t know he meant it this way. I refuse to allow myself to be invaded by bad thoughts, but my disappointment is immense.”