NEW YORK — Police are questioning 26-year-old Luigi Mangione in Altoona, Pennsylvania, as a person of interest in connection with the brazen Midtown Manhattan murder of UnitedHealthcare CEO Brian Thompson last week, according to authorities. Mangione, from Maryland, has been arrested by Altoona police on unrelated gun charges, according to authorities. The man was on a Greyhound bus traveling through Altoona on Monday morning, sources said, when he got off and walked into a McDonald’s where a witness recognized him from the images of the suspect circulated by police. A man in Pennsylvania is being held for questioning in connection with the shooting death of UnitedHealthcare CEO Brian Thompson, law enforcement sources told ABC News. Mangione was sitting and eating when a McDonald’s employee reported him, and “because of that, we believe we have a strong person of interest,” New York City Mayor Eric Adams said at a news conference Monday. “He matches the description of the person we are looking for,” Adams said. Mangione was in possession of a handwritten document “that speaks to his motivation and mindset,” NYPD Commissioner Jessica Tisch said. “It