An America woman dubbed 'Jihad Jane' has been sought to spend years behind bars by prosecutors for her failed plot to kill Swedish cartoonist Lars Vilks but the controversial artist has said they might as well set her free.

Colleen LaRose pleaded guilty to terror-related charges in 2011. Now prosecutors in the US have said the 50-year-old should serve "decades behind bars" for the plot, where she intended to kill Vilks, who sparked outrage by portraying the Prophet Mohammed on the head of a dog in a cartoon.

LaRose risks life imprisonment which is being called for by American guidelines. Her arrest in 2010 generated world headlines as her appearance as a white Texas woman didn't fit the stereotype of an Islamic terrorist.

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