Reports from Tunisia say police have fired tear gas at thousands of Islamists demonstrating in the capital, Tunis.
Reuters reported that the protesters, who were demanding the imposition of Islamic law in Tunisia, responded by throwing stones at police.
It said some of the protesters tried to force their way into the prime minister's office.
Another protest took place outside a private television station that has angered Islamists by airing an animated film that critics accuse of blasphemy for including an image of God.
It was the second rally outside the Nessma TV station in a week after it broadcast "Persepolis," a globally acclaimed animated film about life in Tehran following Iran's 1979 revolution.
Tunisia is scheduled to vote on October 23 for a constitutional assembly -- the first polls in Tunisia since longtime President Zine el-Abidine Ben Ali was overthrown in an uprising in January.
compiled from agency reports