Transcript for Military and FBI issues urgent warning ahead of ‘Joker’ release
We do have a warning from the U.S. Military about the new "Joker" movie alerting service members that there could be potential violence at theaters that are showing the film. Amy has more on this. Law enforcement is taking this seriously. They certainly are, robin. Good morning to you. The FBI first uncovered the possible threats online from alleged extremists sparking new fears after that 2012 theater massacre at the screening of another batman-themed movie. When you bring me out can you introduce me as joker. Reporter: It won't hit theaters until next week but "Joker" is earning rave reviews and now a disturbing warning. Is it just me or is it getting crazier out there? Reporter: Army officials at ft. Sill, Oklahoma are alerting soldiers about possible mass shootings at theaters showing the film. Though there are no specific plots, Texas law enforcement has told officials about potential threats made on social media. This coming after some have criticized the film for row month 150izing the clown prince of crime some fearing it may abben inspiration for real world criminal. As law enforcement has moved through so many mass shootings and so many other types of violence that when they get intelligence, even if it's not specific, they will pass it on to local or state authorities, just so that they are aware. Reporter: The film starring Joaquin Phoenix tells the original story of Batman's most infamous villain, the joker, digging deep into his origin story. Can you stop bothering him? Sorry. Reporter: Depicting the forces that turned a lonely man into a homicidal maniac winning top honors at the Venice film festival and earning Phoenix serious Oscar buzz but in the age of mass shootings some film critics have raised concerns that joker's disaffected lead character could become a hero to those already angry at society. Batman's arch-nemesis has already appeared in several films. Let's put a smile on that face. Reporter: Earning heath ledger a posthumous best supporting actor Oscar but this could be close story a real-life tragedy in the franchise when a gunman opened fire killing 12 people during a screening of "The dark knight rises" no Aurora, Colorado in 2012. This could inspire other would-be killers and the theater in Colorado has opted not to screen the movie. When movies make us uncomfortable or challenge us or make us think differently and I think that's important to be challenged in that way. To me I think it's good that people are having a strong reaction to the movie. Now Warner brothers tells us in a statement gun violence in our society is a critical issue and we extend our deepest sympathy to all victims and families impacted by these tragedies. Make no mistake, neither the fictional character joker nor the film is an endorsement of real world violence of any kind. But certainly making a lot of parents I think nervous about letting their kids go see this movie given what it could inspire. Remarkable that they even have to make a statement like that.
This transcript has been automatically generated and may not be 100% accurate.