PHILADELPHIA (AFP) - An American woman who called herself "JihadJane" pleaded guilty Tuesday to terrorism-related charges stemming from a plot to kill a Swedish cartoonist.

Blonde-haired, blue-eyed Colleen LaRose, 47, simply replied "yes" when she was asked by judge Petrese Tucker if she was pleading guilty.

She pleaded guilty to terrorism, plotting to kill in a foreign country, lying to the FBI and attempted identity theft -- charges for which she could face life imprisonment.

She was arrested in the 2009 plot to kill Swedish cartoonist Lars Vilks, who unleashed a storm of protests from Muslims with his cartoons depicting the prophet Mohammed seen as insulting to Islam.