A man arrested over the fatal shooting of UnitedHealthcare chief executive Brian Thompson was found with a "handwritten" manifesto, the commissioner of the New York City Police Department (NYPD) has said.
Luigi Nicholas Mangione, 26, was detained at a McDonald's in Altoona, Pennsylvania, on Monday morning following a tip-off from an employee who recognised him from police appeals.
He was found carrying a "handwritten document" - reportedly described earlier by police sources as a "manifesto" - which "speaks to both his motivation and mindset", NYPD Commissioner Jessica Tisch told a press conference on Monday.
NYPD Chief of Detectives Joseph Kenny said that from the document, it appeared the suspect had "some ill will towards corporate America".
However, he said there did not appear to be any "specific threats" to other people in the document.
Officials said the suspect, who was arrested around 230 miles away from the scene of the New York shooting, had a silencer and a gun "both consistent with the weapon used in the murder".
They said the gun appeared to be a "ghost gun" - a type of weapon that can be assembled at home from parts and without a serial number - and that it was possibly made using a 3D printer.
Mr Mangione also had a fake New Jersey ID matching a document used by the suspect to check into a hostel in the city before the attack, Ms Tisch added.
Mr Mangione, who was born and raised in Maryland and has links to California and Hawaii's capital Honolulu, was taken to a local police station for questioning.
Detectives from the NYPD are currently en route to Pennsylvania to question him, according to Mr Kenny.
