Violence erupts in northern Italy, as riot police try to break up a protest against the construction of a high speed rail track.<br/> <br />Protesters have been gathered here for four days, hoping to stop the project that would link Lyon, France with Turin.<br/> <br />Security forces use water cannons, and fire tear gas in an attempt to break up the protest.<br/> <br />Demonstrators respond by hurling missiles back.<br/> <br />While being led away by police, one woman shouts "I haven't done anything, let me go".<br/> <br />Another woman curses them from across the road.<br/> <br />Police later broke into building and bars, searching for protesters demonstrators who had been hurling objects at them.<br/> <br />Travis Brecher, Reuters
