If you've seen the now-iconic image of Muhammed with a bomb in his turban, then you've experienced the work of Kurt Westergaard, the most famous of the Danish cartoonists whose 2005 drawings of the Muslim prophet for the newspaper Jyllands-Posten led to worldwide mayhem.

That one drawing changed Westergaard's life. After Danish police arrested three Muslims in 2008 for plotting to kill him in retaliation for the cartoon, he was put under surveillance and a panic room was installed in his house. That room saved his life on New Year's Day 2010, when another Muslim broke into his home wielding an axe and screaming about revenge.

Fast forward to September 9, 2011. Westergaard and his wife traveled to Oslo, where four days later he was to take part in a press conference at a cultural center called Litteraturhuset. The occasion: the publication of a new children's book for which Westergaard had done the illustrations. But on September 12, the day before the event, Westergaard flew home.

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