A teenager of Pakistani origin resident in the US has admitted to assisting in the so-called "Jihad Jane" plot to murder Swedish artist Lars Vilks.

The 18-year-old on Friday pleaded guilty to terrorism charges and faces up to 15 years imprisonment, according to a report in the Star Tribune daily.

Mohammad Hassan Khalid once appeared to have a bright future in the US after completing high school with honours and winning a full scholarship to prestigious Johns Hopkins University, until his arrest by the FBI last summer aged 17.

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