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, seen on the flag, 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. (AP Photo/Hassene Dridi)