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Police in major U.S. cities were on alert on Thursday as “Joker” opened in movie theaters. This is after weeks of publicity surrounding its portrait of a bullied loner raised fears it might spark violence. Movie reviewers have called it a brilliant but terrifying performance as a mentally unhinged outcast. The DC Comics character is associated with a 2012 mass shooting at a movie theater in Aurora, Colorado. Officers armed with assault rifles stood outside a screening of “Joker” at the New York Film Festival. Audiences had their bags searched and K9 officers were on duty, video footage showed. Costumes and face masks have been banned for moviegoers at AMC and Landmark cinemas. Wochit, Wochit