The militia suspected of killing the US ambassador to Libya nearly two weeks ago has been driven out of its base in the eastern city of Benghazi.
Report says the police and protesters stormed the headquarters of the Islamist group, Ansar al-Sharia.
The headquarters of the Sahaty Brigade, said to have official backing, was also stormed. At least nine people were killed there, another died elsewhere.
It would be recalled that the attack on the US consulate was triggered by an amateur video made in the US which mocks Islam.
Protests against the film have been held across the Muslim world. At least 19 people died in Pakistan on Friday alone, in clashes with police trying to stop protesters attacking US diplomatic buildings.
US citizens have been urged not to travel to Pakistan and the US embassy has paid for adverts on Pakistani TV showing President Barack Obama and Secretary of State Hillary Clinton condemning the film.
Witnesses say supporters of Ansar al-Sharia gathered outside its Benghazi headquarters, in front of the crowd, waving black and white banners.