Flying the flag for liberalism, these Tunisians are here to protest the assassination of secular opposition figure Mohamed Brahmi.
Some are calling for the dissolution of the Islamist-led government.
And on the other side of police lines the pro-government crowd, condemning what they call an attempted coup against democracy.
This member of parliament says she is pleased police are keeping the rival protests apart.
This split between Islamists and secular liberals mirrors Egypt, where the democratically elected Islamist president was recently deposed by the military.
Well over 200 Egyptians have died in the ensuing unrest.
In a bid to keep the peace in Tunisia, secular coalition partners of Tunisia's ruling Islamist party said on Saturday they were in talks to reach a new power-sharing deal.
Brahmi's death has raised the stakes, deepening divisions between Islamists and secular liberals.