Unrest in Tunisia after opposition leader killed

Furious protesters on February 6 erected barricades in central Tunis and hurled rocks at police
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Tunisian protesters shout slogans during a rally outside the Interior Ministry to protest against the assassination of Tunisian opposition leader and outspoken government critic Chokri Belaid (poster) on February 6, 2013, in Tunis. The protesters, who massed on Habib Bourguiba Avenue, epicentre of the 2011 uprising that ousted former dictator Zine El Abidine Ben Ali, pelted the police with bottles and the police responded by firing tear gas, chasing the protesters and beating them with batons. (AFP/Getty Images)
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A Tunisian protester removes barbed wire during a rallye outside the Interior ministry to protest after Tunisian opposition leader and outspoken government critic Chokri Belaid was shot dead with three bullets fired from close range, on February 6, 2013 n Tunis. The protesters, who massed on Habib Bourguiba Avenue, epicentre of the 2011 uprising that ousted ex-dictator Zine El Abidine Ben Ali, pelted the police with bottles and the police responded by firing tear gas, chasing the protesters and beating them with batons. (AFP/Getty Images)
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Tunisian protesters shout slogans during a rallye outside the Interior ministry to protest after Tunisian opposition leader and outspoken government critic Chokri Belaid was shot dead with three bullets fired from close range, on February 6, 2013 in Tunis. The protesters, who massed on Habib Bourguiba Avenue, epicentre of the 2011 uprising that ousted ex-dictator Zine El Abidine Ben Ali, pelted the police with bottles and the police responded by firing tear gas, chasing the protesters and beating them with batons. (AFP/Getty Images)
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A Tunisian protester jumps amid smoke after police fired tear gas during a rallye outside the Interior ministry to protest after Tunisian opposition leader and outspoken government critic Chokri Belaid was shot dead with three bullets fired from close range, on February 6, 2013 in Tunis. The protesters, who massed on Habib Bourguiba Avenue, epicentre of the 2011 uprising that ousted ex-dictator Zine El Abidine Ben Ali, pelted the police with bottles and the police responded by firing tear gas, chasing the protesters and beating them with batons. (AFP/Getty Images)
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Policemen fired tear gas during clashes with protesters following a rallye outside the Interior ministry to protest after Tunisian opposition leader and outspoken government critic Chokri Belaid was shot dead, on February 6, 2013 in Tunis. The protesters, who massed on Habib Bourguiba Avenue, epicentre of the 2011 uprising that ousted ex-dictator Zine El Abidine Ben Ali, pelted the police with bottles and the police responded by firing tear gas, chasing the protesters and beating them with batons. (AFP/Getty Images)
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An elderly woman is escorted away from tear gas smoke during clashes between Tunisian police and protesters following a rally outside the Interior ministry to protest after Tunisian opposition leader and outspoken government critic Chokri Belaid was shot dead, on February 6, 2013 in Tunis. The protesters, who massed on Habib Bourguiba Avenue, epicentre of the 2011 uprising that ousted ex-dictator Zine El Abidine Ben Ali, pelted the police with bottles and the police responded by firing tear gas, chasing the protesters and beating them with batons. (AFP/Getty Images)
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The father of assassinated Tunisian opposition leader and outspoken government critic Chokri Belaid mourns after his killing on February 6, 2013, at a clinic in Tunis. Belaid was gunned down outside his home in Tunis, sparking angry protests by his supporters and attacks on offices of the ruling Islamist Ennahda party. (AFP/Getty Images)
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Human rights activist and lawyer Mokhtar Trifi (L) and Basma Khalfaoui Belaid (C), the wife of assassinated Tunisian opposition leader and outspoken government critic Chokri Belaid, mourn over the latter's death after he was shot dead with bullets fired from close range on February 6, 2013, at a clinic in Tunis. President Moncef Marzouki has cancelled his participation in the Organisation of Islamic Cooperation summit in Cairo and is heading back to Tunisia after the murder of opposition leader Chokri Belaid, the presidency said. His assassination comes at a time when Tunisia is witnessing a rise in violence fed by political and social discontent two years after the mass uprising that toppled the former dictator Zine El Abidine Ben Ali. (AFP/Getty Images)
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The leader of the Communist Party of Tunisian Workers (PCOT) Hamma Hammami answers to journalists' questions after the killing of Tunisian opposition leader and outspoken government critic Chokri Belaid on February 6, 2013, at a clinic in Tunis. Belaid was gunned down outside his home in Tunis, sparking angry protests by his supporters and attacks on offices of the ruling Islamist Ennahda party. (AFP/Getty Images)
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Tunisian President Moncef Marzouki looks on as he arrives at the European Parliament in Strasbourg, eastern France on February 6, 2013. Marzouki denounced 'the odious assassination' of his friend and opposition leader Chokri Belaid in an impassioned speech Wednesday that brought tears to the eyes of Europe's politicians. (AFP/Getty Images)