(CNN) Both the US Army and the Los Angeles Police Department will be on alert -- and one theater chain has banned all costumes -- during the screening of "Joker."

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.

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