A chaotic night Tuesday in downtown Minneapolis included fights, injuries and arrests. Police say it all began with a large group of teens who used mass transit to travel downtown with the intention of causing trouble. The group of young people fought amongst themselves and blocked traffic near Nicollet Mall amid St. Patrick's Day celebrations. View raw Chopper 5 video of the scene here. The disturbance was widespread and included the areas between 3rd and 8th streets, and Marquette and Hennepin avenues. Additional police officers were called in to restore order. They arrested as many as six people, and used...