Italian police filed charges against one person after racist abuse during game . Abuse prompted AC Milan players to walk off in middle of game . Kevin - John Boateng kicked ball into stands , tore his shirt and sent his team off . Italian Football Association president Giancarlo Abete ordered investigation into incident .
Italian prosecutors press charges against one person after racist abuse during game . Abuse prompted AC Milan players to walk off in middle of game . Kevin-Prince Boateng kicked ball into stands , tore his shirt and led his team off . Italian Football Association president Giancarlo Abete announced investigation into incident .