Violence erupts in northern Italy, as riot police try to break up a protest against the construction of a high speed rail track.

Protesters have been gathered here for four days, hoping to stop the project that would link Lyon, France with Turin.

Security forces use water cannons, and fire tear gas in an attempt to break up the protest.

Demonstrators respond by hurling missiles back.

While being led away by police, one woman shouts "I haven't done anything, let me go".

Another woman curses them from across the road.

Police later broke into building and bars, searching for protesters demonstrators who had been hurling objects at them.

Travis Brecher, Reuters