The FBI has issued a warning about potential threats for a mass shooting linked to the release of the new “Joker” movie, according to a report by ABC News.

ABC News reports that threats have been cycling online since May, but that no specific information has been posted.

ABC reports that the threats contained references to “Incels,” an online subculture of people, mostly males, who are “involuntarily celibate.”

Several recent perpetrators of mass shooting violence have self-identified as “Incels,” but ABC reports that the FBI does not necessarily regard the group as a whole as one prone to violence.

ABC also reports that some of the threats made reference to Aurora, Colorado, where a mass shooting occurred in 2012 at a movie theater showing another Batman movie, “The Dark Knight Rises.”

Some of the Aurora shooting victims have urged Warner Bros., the studio behind “Joker,” to support gun control. The victims said that they were alarmed by the violence depicted in the trailer.

“Joker” stars Joaquin Phoenix and tells the origin of the iconic comic book character of the same name. The official plot summary of the movie states that it is about “a man disregarded by society.”

Parts of “Joker” were filmed around New Jersey, particularly in Newark.

“Joker” opens Friday nationwide.