A theater chain being sued by three Colorado moviegoers who were hurt when a gunman opened fire during a July screening of the "Dark Knight Rises" said on Thursday the lawsuits should be dismissed, court papers show. James Holmes, a 24-year-old former neuroscience graduate student at the University of Colorado, has been charged with murder and attempted murder for the rampage that killed 12 people and wounded 58 others. Lawyers for Cinemark USA are seeking dismissal of the lawsuits filed last week in Denver federal court by the victims, who said the theater had lax security.