video transcript

Preparing for -- fight in the wrong. French security forces face off with protesters. In heart France's third largest city. As helicopters -- ever had to track down rioters. In the French police swat teams were in full view behind riot police . A clear signal to rioters spit it heavy response would be forthcoming. -- fighting degenerated further. The running battles lasted much of the afternoon. Youths hurl projectiles at police responded with fire from anti riot weapon. Shattered glass bore witness to an afternoon I'm clashes. -- France's wealthiest cities and more commonly associated with fine dining been riots. -- has seen the worst violence of this week's street protests against austerity measures. Clashes injured two dozen people. -- leader back Reuters.