A Swedish cartoonist whose sketch of the Prophet Mohammed enraged many Muslims, was attacked while giving a lecture about freedom of speech.

Lars Vilks, who depicted the Prophet Mohammad with the body of a dog in 2007, said he was headbutted by a man sitting on the front row as he spoke at the University of Uppsala, about 44 miles from Stockholm.

"He head-butted me and I fell into the wall and lost my glasses," Mr Vilks said. He added he was unharmed.

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