A founder of the satirical French magazine Charlie Hebdo has accused its editor, Stéphane Charbonnier, who was killed in the deadly attack on the magazine's office last Wednesday, of "dragging the team" to their deaths by publishing provocative cartoons of the Prophet Mohamed, The Telegraph reported on Wednesday.Henri Roussel, 80, contributed to the first issue of the satirical weekly in 1970. He reportedly wrote to the murdered editor, saying: "I really hold it against you." Roussel reportedly called Charbonnier an "amazing lad", adding that he was a stubborn "block head". "What made him feel the need to drag the team into overdoing it?" he asked, referring to Charb's decision to post a Mohammed character on the magazine's front page in 2011.