AceShowbiz - Bosses at a Huntington Beach cinema in California were forced to close their doors on Thursday, October 3 following a credible threat related to a "Joker" screening.
The Century Huntington Beach and XD theatre in the Bella Terra shopping centre was shuttered for the evening.
Huntington Beach Police Department spokeswoman Angela Bennett tells the Los Angeles Times, "We took the threat seriously, and we're investigating."
Security has been stepped up at many cinemas across America amid fears the violent new Todd Phillips drama, starring Joaquin Phoenix as the twisted Batman villain, would attract unstable fans with deadly intent.
Seven years ago, a gunman killed 12 people at a movie theatre in Aurora, Colorado during a screening of the 2012 Batman film "The Dark Knight Rises".
The families of the victims issued a letter to film bosses at Warner Bros. last week, expressing concern over their Joker movie's violence.
Bosses at the Colorado cinema have opted not to show the new origin film.