One protester has been killed and two others wounded in clashes with police on the streets of Tripoli.
The fatality happened as demonstrators stormed a government building.
Twelve members of the security forces have also been injured as crowds pelted police with stones.
The mob attacked an American fast food outlet amid anger over a US made film called the ‘Innocence of Muslims.’
Police used live rounds and teargas to try to disperse the protesters.
The violence comes as the Pope embarks on the three-day visit to the country.