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The movie hits theaters next week -- and it's the follow-up to 2012's "The Dark Knight Rises," which saw a mass shooting in Colorado during a midnight showing.
The Los Angeles Police Department has announced that officers will have "high visibility" at theaters during premiere screenings of "Joker."
The US Army, meanwhile, confirmed it had sent out a memo obtained by CNN to commanders in Fort Sill, Oklahoma, about a potential violent threat discovered in discussion on the dark web about the possible targeting of a theater during the movie's release.
The Fort Sill Criminal Investigation Command office "did so out of an abundance of caution to help keep our soldiers and their families safe," said Chris Grey, a spokesperson for USA CID.
"At this point, we are not aware of any information indicating a specific, credible threat to a particular location or venue," he said.
LAPD asks residents to stay vigilant
The LAPD said in a statement to CNN that it is aware of the public concerns surrounding the premiere of the "Joker."
"While there are no credible threats in the Los Angeles area, the Department will maintain high visibility around movie theaters when it opens," the LAPD said. "We encourage everyone to go out and enjoy all of the weekend leisure activities the City has to offer. However, Angelenos should remain vigilant and always be aware of your surroundings. As always, if you see something, say something."
Landmark bans costume
Meanwhile, Landmark Theatres, which owns 52 theaters in 27 markets, has extended its ban on masks and toy weapons to include all costumes during "Joker's" theatrical run. The company declined to comment on its operating procedures but the policy mentions the film specifically.
Warner Bros. asked to take a stance on gun violence
In a letter addressed to Warner Bros. CEO Ann Sarnoff and obtained by CNN, five family members and friends of victims of the theater shooting asked the studio to "use your massive platform and influence to join us in our fight to build safer communities with fewer guns." (Warner Bros., like CNN, is owned by WarnerMedia.)
"Over the last several weeks, large American employers from Walmart to CVS have announced that they are going to lean into gun safety. We are calling on you to be a part of the growing chorus of corporate leaders who understand that they have a social responsibility to keep us all safe," the letter states.
The letter asked execs to end political contributions to candidates who take money from the NRA and vote against gun reform, actively lobby for gun reform and make contributions to groups that support survivors and aim to reduce gun violence.
In a statement, Warner Bros. studio acknowledged that gun violence is "a critical issue."
The statement continued:
"At the same time, Warner Bros. believes that one of the functions of storytelling is to provoke difficult conversations around complex issues. Make no mistake: neither the fictional character Joker, nor the film, is an endorsement of real-world violence of any kind. It is not the intention of the film, the filmmakers or the studio to hold this character up as a hero."
CNN's Stella Chan and Harmeet Kaur contributed to this story.