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The body of Tunisian opposition Chokri Belaid (top R) arrives amidst tens of thousands of protesters as they demonstrate on Avenue Habib Bourguiba in Tunis February 6, 2013. Tunisia's secular opposition Popular Front said it was pulling out of the constituent assembly charged with writing a constitution after an opposition politician was killed on Wednesday. REUTERS/Anis Mili

A man cries at the ambulance carrying the body of Chokri Belaid after he was shot to death in Tunis, Wednesday, Feb. 6, 2013. The Tunisian opposition leader critical of the Islamist-led government and violence by radical Muslims was shot to death Wednesday ó the first political assassination in post-revolutionary Tunisia. The killing is likely to heighten tensions in the North African nation whose path from dictatorship to democracy so far has been seen as a model for the Arab world. (AP Photo/Amine Landoulsi)

Protesters gather with a Tunisian flag at the ambulance carrying the body of opposition leader Chokri Belaid in Tunis, Wednesday, Feb. 6, 2013. The Tunisian opposition leader critical of the Islamist-led government and violence by radical Muslims was shot to death Wednesday, the first political assassination in post-revolutionary Tunisia. The killing is likely to heighten tensions in the North African nation whose path from dictatorship to democracy so far has been seen as a model for the Arab world. (AP Photo/Amine Landoulsi)

The body of Shokri Belaid, a prominent Tunisian opposition politician, is carried into an ambulance after he was shot, in Tunis February 6, 2013. A prominent Tunisian opposition politician was shot dead outside his home on Wednesday, in a killing the prime minister condemned as a political assassination and a strike against the "Arab Spring" revolution. Prime Minister Hamadi Jebali said the identity of the killer of Shokri Belaid, a staunch secular opponent of the moderate Islamist-led government, was unknown. REUTERS/Zoubeir Souissi

A woman mourns for assassinated prominent Tunisian opposition politician Shokri Belaid in Tunis, February 6, 2013. A prominent Tunisian opposition politician was shot dead outside his home on Wednesday, in a killing the prime minister condemned as a political assassination and a strike against the "Arab Spring" revolution. Prime Minister Hamadi Jebali said the identity of the killer of Shokri Belaid, a staunch secular opponent of the moderate Islamist-led government, was unknown. REUTERS/Zoubeir Souissi

Demonstrators raise their hands to protest the killing of opposition leader Chokri Belaid in Tunis, Wednesday, Feb. 6, 2013. The Tunisian opposition leader critical of the Islamist-led government and violence by radical Muslims was shot to death Wednesday, the first political assassination in post-revolutionary Tunisia. The killing is likely to heighten tensions in the North African nation whose path from dictatorship to democracy so far has been seen as a model for the Arab world. (AP Photo/Amine Landoulsi)

Protesters gather on Tunis 'main avenue after a Tunisian opposition leader critical of the Islamist-led government was gunned down as he left home Wednesday, Feb.6, 2013. Chokri Belaid was gunned down as he left home in the first assassination in post-revolutionary Tunisia. The killing of Belaid, a 47-year-old lawyer, heightens tensions in the North African nation whose path from dictatorship to democracy has been seen as a model for the Arab world so far. Poster at left reads: Man vomited on you. (AP Photo/Hassene Dridi)

Tunisian protesters shout slogans during a demonstration after the death of Tunisian opposition leader Chokri Belaid (pictured on flag), outside the Interior ministry in Tunis February 6, 2013. Tunisia's secular opposition Popular Front said it was pulling out of the constituent assembly charged with writing a constitution after an opposition politician was killed on Wednesday. REUTERS/Anis Mili

A police officer fires teargas to break up a protest during a demonstration in Tunis February 6, 2013. Tunisian police fired teargas to disperse protesters demonstrating in the capital outside the Interior Ministry against the killing of a prominent secular opposition politician on Wednesday, witnesses said. REUTERS/ Zoubeir Souissi

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. FETHI BELAID/AFP/Getty Images

Tunisian protesters clash with riot police during a demonstration after the death of Tunisian opposition leader Chokri Belaid, outside the Interior ministry in Tunis February 6, 2013. Tunisia's secular opposition Popular Front said it was pulling out of the constituent assembly charged with writing a constitution after an opposition politician was killed on Wednesday. REUTERS/Anis Mili

Tunisian protesters clash with riot police slogans during a demonstration after the death of Tunisian opposition leader Chokri Belaid, outside the Interior ministry in Tunis February 6, 2013. Tunisia's secular opposition Popular Front said it was pulling out of the constituent assembly charged with writing a constitution after an opposition politician was killed on Wednesday. REUTERS/Anis Mili

A police officer fires teargas to break up a protest during a demonstration in Tunis February 6, 2013. Tunisian police fired teargas to disperse protesters demonstrating in the capital outside the Interior Ministry against the killing of a prominent secular opposition politician on Wednesday, witnesses said. REUTERS/ Anis Mili

A demonstrator shouts near the ambulance carrying the body of opposition leader Chokri Belaid in Tunis, Wednesday, Feb.6, 2013. The Tunisian opposition leader critical of the Islamist-led government and violence by radical Muslims was shot to death Wednesday, the first political assassination in post-revolutionary Tunisia. The killing is likely to heighten tensions in the North African nation whose path from dictatorship to democracy so far has been seen as a model for the Arab world. (AP Photo/Amine Landoulsi)

Demonstrators burn documents of the Ennahda party, outside the party's headquarters, during a demonstration in Gafsa February 6, 2013. Thousands of Tunisians demonstrated outside the Interior Ministry headquarters following the slaying of secular opposition leader Chokri Belaid. REUTERS/Stringer

A police officer readies teargas to break up a protest during a demonstration in Tunis February 6, 2013. Tunisian police fired teargas to disperse protesters demonstrating in the capital outside the Interior Ministry against the killing of a prominent secular opposition politician on Wednesday, witnesses said. REUTERS/ Anis Mili

A police officer reacts after teargas was used to break up a protest in Tunis February 6, 2013. Tunisian police fired teargas to disperse protesters demonstrating in the capital outside the Interior Ministry against the killing of a prominent secular opposition politician on Wednesday, witnesses said. REUTERS/ Anis Mili

Protesters demonstrate after the killing of opposition leader Chokri Belaid in Tunis, Wednesday, Feb. 6, 2013. The Tunisian opposition leader critical of the Islamist-led government and violence by radical Muslims was shot to death Wednesday, the first political assassination in post-revolutionary Tunisia. The killing is likely to heighten tensions in the North African nation whose path from dictatorship to democracy so far has been seen as a model for the Arab world. (AP Photo/Amine Landoulsi)

A man crosses the street as Tunisians demonstrate the killing of Chokri Belaid in Tunis, Wednesday, Feb.6, 2013. The Tunisian opposition leader critical of the Islamist-led government and violence by radical Muslims was shot to death Wednesday ó the first political assassination in post-revolutionary Tunisia. The killing is likely to heighten tensions in the North African nation whose path from dictatorship to democracy so far has been seen as a model for the Arab world. (AP Photo/Amine Landoulsi)

Police officers secure the scene where Tunisian opposition leader Chokri Belaid was shot to death in Tunis, Wednesday, Feb. 6, 2013. A critic of the Islamist-led government and violence by radical Muslims, Belaid was shot to death outside his home Wednesday, in the first political assassination in post-revolutionary Tunisia. The killing is likely to heighten tensions in the North African nation whose path from dictatorship to democracy so far has been seen as a model for the Arab world. (AP Photo/Amine Landoulsi)

A forensic inspector (R) looks at the car of prominent Tunisian opposition politician Shokri Belaid, who was shot dead outside his home, in Tunis February 6, 2013. Belaid was shot dead outside his home on Wednesday, in a killing the prime minister condemned as a political assassination and a strike against the "Arab Spring" revolution. Prime Minister Hamadi Jebali said the identity of the killer of Belaid, a staunch secular opponent of the moderate Islamist-led government, was unknown. REUTERS/Zoubeir Souissi

A protester holds a poster reading "Tunisia in mourning, RIP Chokri Belaid, Ennahdha get out" as others hold candles during a demonstration on February 6, 2013 held outside the Tunisian embassy in Paris against the killing today of prominent Tunisian opposition leader Chokri Belaid. Furious protesters on February 6 erected barricades in central Tunis and hurled rocks at police who tried to disperse them with tear gas in new clashes after the assassination of a prominent opposition figure. MEHDI FEDOUACH/AFP/Getty Images