...from the attached article...
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The man who is being held in Pennsylvania was also in possession of a two-page document railing against the health care industry and suggesting that violence is the answer, a police official who has seen the document told CNN.
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Link: https://www.cnn.com/us/live-news/brian-thompson-unitedhealthcare-death-investigation-12-9-24#cm4hc4zlq00123b6mqsd5ak8m