This happened on May 27. Students had called an assembly at the Piazza Verdi of Bologna and the governor had forbidden it (in yet another example of lack of any real democracy in Europe). The students bravely conquered their right of assembly and police run away.
That's exactly how Ben Ali was kicked from Tunisia: after many protests repressed by police, one happy day, the protesters, much more numerous than the armed forces, turned around and took their rights, their freedom.
Source: Madriz Rebelde[es].