The hall was evacuated and the man quickly left the building, waving the gun as he walked toward his car. He was then overpowered by two Jehovah's Witnesses and arrested.
Police said the man also had a samurai sword and a knife.
Notes found during a search of the man's apartment suggested that he had intended to shoot into the crowd, according to police. Investigators believe that a technical defect prevented him from doing so.
He apparently blamed the Jehovah's Witnesses for the fact he had lost contact with his daughter years ago, police added.
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