In New York, the NYPD plans to deploy plain-clothes officers to theaters in all five boroughs, as well as the previously announced uniformed patrols that will be stationed at every screening, Deadline writes.

Other theaters will take different actions. A theater chain in Milwaukee “posted on social media a change in its bag and package policy going into effect Tuesday. Moviegoers can bring into theaters bags or packages no bigger than 12 inches by 12 inches by 6 inches,” the Journal Sentinel reports.

Movie theaters around the country are also banning masks and costumes at showings amid concerns about the movie’s violent theme.  Landmark Theaters, for instance, which has 52 locations nationwide, is banning masks, costumes at screenings.

” ‘Joker’ centers around the iconic arch nemesis and is an original, standalone fictional story not seen before on the big screen,” Rotten Tomatoes says. “Phillips’ exploration of Arthur Fleck, who is indelibly portrayed by Joaquin Phoenix, is of a man struggling to find his way in Gotham’s fracturedsociety. A clown-for-hire by day, he aspires to be a stand-up comic at night… but finds the joke always seems to be on him. Caught in a cyclical existence between apathy and cruelty, Arthur makes one bad decision that brings about a chain reaction of escalating events in this gritty character study.”