Police had not released the document to the public as of December 10. Some X users were sharing what they said was a manifesto Mangione published on Substack.
Substack removed the post for violating Substack's Content Guidelines, which prohibit impersonation. New York City Police officials pointed to a handwritten document found at the arrest site.
New York City Police Commissioner Jessica Tisch said on December 9 that police had found a handwritten document that speaks to both his motivation and mindset.
Mangione described the act as a symbolic takedown of the healthcare industry, citing alleged corruption and power games. This aligns with his expressed motivations.
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