FILE - This Saturday, Dec. 1, 2012 file photo shows Tunisian protesters clashing with riot police, in Siliana, Tunisia. Two years after the revolution that overthrew a dictator and started the Arab Spring, Tunisia is struggling with high unemployment and rising violence in its politics. After sounding the alarm for months over the rise of religious extremists, the opposition now warns that the new threat to this North African country's democratic transition are vigilante bands allied to the elected government.  (AP Photo/Amine Landoulsi, File)
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