The Army has warned about a potential mass shooting being planned to take place when a new Warner Bros. film, “Joker,” opens in theaters next month. A memo issued this week to Army personnel stationed in Fort Sill, Oklahoma, said that the base’s Criminal Investigation Division (CID) received intelligence about a “credible potential mass shooting to occur at an unknown movie theater during the release of the new Joker movie scheduled on October 4, 2019.”