Luigi Mangione is believed to be a person of interest in last week's deadly shooting of UnitedHealthcare CEO Brian Thompson, police said Monday. The 26-year-old was arrested on firearms charges in Pennsylvania, where New York police detectives were heading to interview him amid a massive manhunt for the shooter.

Luigi Mangione's defense attorney said he has seen "no evidence" linking his client to the killing, adding that "a lot of guns look the same."