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People throng the streets as an ambulance carries the body of Tunisian opposition leader Chokri Belaid outside the hospital towards the morgue, after he was shot to death in Tunis, Wednesday, Feb. 6, 2013. A critic of the Islamist-led government and violence by radical Muslims, Belaid was killed 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)

People throng the streets as an ambulance carries the body of Tunisian opposition leader Chokri Belaid outside the hospital towards the morgue, after he was shot to death in Tunis, Wednesday, Feb. 6, 2013. A critic of the Islamist-led government and violence by radical Muslims, Belaid was killed 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)

Tunisia protests slaying of secular leader

Thousands of protesters gathered in Sidi Bouzid, cradle of the Arab

Spring uprisings, after a prominent secular opponent of Tunisia's

moderate Islamist-led government was shot dead on Feb. 6. The assassination of Chokri Belaid has plunged Tunisia deeper into political crisis.