Las Vegas police have closed their investigation into the Mandalay Bay massacre carried out by Stephen Paddock - and they still have no idea why he did it.

Fifty-eight people were killed and hundreds more wounded in the Oct. 1 shooting, and authorities say they have yet to find a single shred of evidence to back up a motive.

Clark County Sheriff Joe Lombardo released the Metropolitan Police Department's final report on Friday, but it only offered a glimpse inside of Paddock's "paranoid and delusional" brain.

"What we have been able to answer are the questions of who, what, when, where and how," Lombardo told reporters at a press conference. "What we have not been able to definitively answer is the 'why' Stephen Paddock committed this act."

The 64-year-old retiree suffered from "mental illness" and was believed to have been bipolar, but had never been diagnosed or arrested before, according to investigators.

"There was no evidence of radicalization or ideology to support any theory that Paddock supported or followed any hate group or any domestic or foreign terrorist organization," the report states.

"Despite numerous interviews with Paddock's family, acquaintances and gambling contacts, investigators could not link Paddock to any specific ideology…Although Paddock's liquid wealth declined prior to 1 October, the investigation proved Paddock was self-funded through his gambling and past real estate transactions.

He was indebted to no one and paid all his gambling debts off prior to the shooting. Although investigators were told early on in the investigation Paddock had a bank account frozen for high dollar transfers, it was determined this information was false for the two years preceding the incident."

While investigators were unable to discover a motive, cops said there were "certain indicators of intent" shown by Paddock leading up to the shooting.

The twice-divorced gambler made reservations to attend two different music festivals before eventually setting his sights on the Route 91 Harvest festival in Vegas. One was Lollapalooza in Chicago and the other was the Life is Beautiful festival - also in Sin City.

Paddock "specifically requested" rooms overlooking the venues and was "observed in video surveillance transporting several suitcases from his vehicle to the units he reserved."

"Investigators have been unable to determine if Paddock intended an attack during this festival or if he used it as a means to plan a future attack," but his intentions were clear, the report says.

"Paddock purchased over 55 firearms, which were mostly rifles in various calibers, from October 2016 to September 2017," according to investigators. "He bought over 100 firearm-related items through various retailers."
Overall, police believe Paddock "acted alone" and got help from no one else.

"In reference to the 2,000 investigated leads, 22,000 hours of video, 252,000 images obtained and approximately 1,000 served legal processes, nothing was found to indicate motive," the report says.

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