Tens of thousands of mourners have gathered in Tunisia's capital, Tunis, ahead of the burial of assassinated opposition leader Chokri Belaid.
Police have fired tear gas at protesters in Tunis and the town of Gafsa. A general strike is also being observed.
Mr Belaid was shot dead on Wednesday by a gunman who fled on a motorcycle.
Unions say the government led by the Islamist Ennahda party is to blame for the killing, an accusation it denies.
Prime Minister Hamadi Jebali has tried to defuse tensions by calling for a non-partisan technocratic government. However, his party has refused to accept this.
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