I Akayesu definierade Rwandatribunalen brottet som ” directly provoking the perpetrator ( s ) to commit genocide , whether through speeches , shouting or threats uttered in public places or at public gatherings , or through the sale or display of written material or printed matter in public places or at public gatherings , or through the public display of placards or posters , or through any other means of audiovisual communication ” .