Police arrested a suspect in the killing of UnitedHealthcare CEO Brian Thompson in Altoona, Pennsylvania, on Monday.

Luigi Mangione, 26, has been categorized as a “person of interest” by New York City Police Commissioner Jessica Tisch. She added that Mangione had multiple items on him, including a firearm with a suppressor, a fake ID, and a “handwritten document that speaks to both his motivation and mindset,” when arrested by local police in Pennsylvania on local firearms charges.

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Mangione was discovered at a McDonald’s and was recognized by an employee, according to officials. She said NYPD detectives were on their way to Pennsylvania to question him.

This is a breaking story and will be updated.