Luigi Mangione: What we know about CEO shooting 'person of interest'

Police have named a "strong person of interest" in the slaying of the chief executive of United Healthcare in New York City following a nearly week-long manhunt.

Police said on Monday that they arrested Luigi Mangione, 26, on firearms charges after he was recognised by an employee at a McDonald's restaurant in Altoona, Pennsylvania, according to New York officials.

He was carrying a weapon and "multiple fraudulent IDs", including a New Jersey ID that matched the identity the suspect used to check into a New York City hostel before the shooting.

He also had a three-page handwritten manifesto that included grievances with the US healthcare system, a document that spoke to the suspect's "motivation and mindset", officials said.

Mr Mangione was born and raised in Maryland and has ties to San Francisco, California, according to New York Chief of Detectives Joseph Kenny.

He has no prior arrests in New York and his last previous address was in Honolulu, Hawaii, police said.

He attended a private, all-boys high school in Baltimore, Maryland, according to a LinkedIn account, which appears to belong to him. Mr Mangione was named as the valedictorian of Gilman School.

He is also a graduate of the University of Pennsylvania, where he studied computer science and founded a video game development club.

A friend who attended the university at the same time as Mr Mangione described him as a "super normal" and "smart person".

"I would never have expected this," the friend said.

Mr Mangione worked as a data engineer for TrueCar, a digital retailing website for new and used cars, according to his social media profiles.

Before that, according to the LinkedIn profile, Mr Mangione worked as a programming intern for Fixarixis, a video game developer.

The BBC has contacted TrueCar for comment.

Authorities are planning to interview Mr Mangione while he is being held in Pennsylvania.

He was taken into custody at a McDonald's after an employee spotted him and alerted police.

Mr Mangione was in possession of a so-called ghost gun, a largely untraceable firearm that can be assembled at home using kits, that was likely manufactured on a 3D printer, according to police officials. He also had a suppressor.

Police said he was carrying several IDs, including one with his real identity and another that was fake. These IDs include a US passport and a fraudulent New Jersey ID that was used to check into the New York City hostel, where the suspect was spotted before the shooting

Police also say he was found with handwritten documents - also described as a "three-page manifesto", adding the document showed that he seems to have "ill will towards corporate America".

Police revealed that finding the 26-year-old was a complete surprise, and that they did not have his name on a list of suspects prior to today

Social media profiles provide some possible clues about Mr Mangione's thinking. A person matching his name and photo had an account on Goodreads, a user-generated book review site, where he gave four stars to a text called Industrial Society and Its Future by Theodore Kaczynski – more popularly known as the Unabomber manifesto.

Starting in 1978, Kaczynski carried out a bombing campaign that killed three people and injured dozens of others, until he was arrested in 1996.

In his review, Mr Mangione wrote: "When all other forms of communication fail, violence is necessary to survive. You may not like his methods, but to see things from his perspective, it's not terrorism, it's war and revolution."

"Violence never solved anything' is a statement uttered by cowards and predators."

Police say a document written by Luigi Mangione include specific threats to other people, "but it does seem he has some ill will towards corporate America".