“We have not been able to definitively answer the ‘why,’” Clark County Sheriff Joe Lombardo said Friday at a news briefing to discuss the department’s final report on the Oct. 1 shooting on the Las Vegas Strip.

Clark County Sheriff Joe Lombardo speaks at a news conference Friday, Aug. 3, 2018, in Las Vegas. Lombardo spoke about the final report on the Oct. 1, 2017, shooting that became the deadliest in modern U.S. history. (AP Photo/John Locher)

Clark County Sheriff Joe Lombardo speaks at a news conference Friday, Aug. 3, 2018, in Las Vegas. Lombardo spoke about the final report on the Oct. 1, 2017, shooting that became the deadliest in modern U.S. history. (AP Photo/John Locher)

Clark County Sheriff Joe Lombardo speaks at a news conference regarding the Oct. 1 shooting on Friday, Aug. 3, 2018, in Las Vegas. More than 10 months after the deadliest mass shooting in modern U.S. history, police say they are closing their investigation without answering the key question: What drove a gunman to unleash a hail of gunfire that killed 58 people and wounded hundreds more? (AP Photo/John Locher)

Clark County Sheriff Joe Lombardo speaks at a news conference Friday, Aug. 3, 2018, in Las Vegas. Lombardo spoke about the final report on the Oct. 1, 2017, shooting that became the deadliest in modern U.S. history. (AP Photo/John Locher)

Sheriff Joe Lombardo answers questions during a news conference to announce the release of the final report on the Oct. 1 shooting at Las Vegas Metropolitan Police Department headquarters on Friday, Aug. 3, 2018. Michael Quine / Las Vegas Review-Journal @Vegas88s

Sheriff Joe Lombardo answers questions during a news conference to announce the release of the final report on the Oct. 1 shooting at Las Vegas Metropolitan Police Department headquarters on Friday, Aug. 3, 2018. Michael Quine / Las Vegas Review-Journal @Vegas88s

Las Vegas police have concluded their investigation into the Oct. 1 shooting with no clear idea of why Stephen Paddock murdered 58 people and wounded hundreds more.

Clark County Sheriff Joe Lombardo released the Metropolitan Police Department’s final report on Friday but said investigators were not able to determine a motive for the deadliest random shooting in U.S. history.

“What we have been able to answer are the questions of who, what, when, where and how,” Lombardo said at a news briefing. “What we have not been able to definitively answer is the ‘why’ Stephen Paddock committed this act.”

Paddock, 64, opened fire with high-powered rifles on concertgoers attending the Route 91 Harvest country music festival from his 32nd-floor room at the Mandalay Bay resort shortly after 10 p.m. He fitted the rifles with devices known as bump stocks so they would fire sustained bursts like automatic weapons.

The attack ended when Paddock killed himself with a gunshot to the head.

He acted alone, left no suicide note or manifesto, and police found no evidence that he belonged to or supported any hate group or terrorist organization, domestic or foreign. He had no criminal record, and financially, he was indebted to no one, the investigation found.

“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 on the part of Paddock or that he acted with anyone else,” the report states.

Investigators did identify what they called “indicators of intent,” most of which authorities had previously reported.

Those indicators included a room Paddock rented but never checked into in August 2017 that overlooked Lollapalooza, an open-air music festival held in downtown Chicago’s Grant Park.

Police also pointed to three different rooms Paddock rented in September overlooking the Life is Beautiful festival in downtown Las Vegas. He stayed in those rooms, and surveillance footage captured him carrying several suitcases to each of them during his stay, similar to what he did at Mandalay Bay.

“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,” the final report states.

Paddock’s internet search history included terms related to other open-air venues, Las Vegas police SWAT tactics, weapons, explosives and various weapons stores. He began building an arsenal of about 55 weapons in October 2016, spending an estimated $95,000 on various firearms and ammunition, according to the report.

An Arizona man accused of supplying Paddock with armor-piercing rounds is the only person to be charged in connection with the case. Douglas Haig faces federal charges of conspiracy to illegally manufacture and sell the ammunition.

Lombardo said he does not anticipate more arrests.

The 187-page final report does not address police tactics or the emergency reponse to the attack.

“This is not a review of every officer’s actions or responses that took place that night,” Lombardo explained. “Those reviews are internal and are considered personnel matters. They will not be released to the public.”

He did say that no Metro personnel have been disciplined as a result of their actions that night.

As police moved into an adjoining room of Paddock’s suite, SWAT officer Sean O’Donnell accidentally fired a three-round burst from his rifle into the wall while he was trying to adjust the rate of fire on the weapon.

The sheriff also defended the performance of the communications system during the chaos of the shooting and its aftermath.

“There’s no system in the world that can handle that kind of volume in a short period of time,” he said of the radio issues that officers experienced. “I personally believe the communications system was sound and robust.”

Lombardo said the FBI’s Behavior Analysis Unit is expected to release its detailed review of Paddock’s “psychopathology” by the end of the year.

Sgt. Terry MacDonald, who helped lead Metro’s investigation, said he doesn’t expect that report to reveal a motive either, but “it might be the closest we get.”

As far as Metro is concerned, the investigation is complete “unless new information comes to light,” Lombardo said.

The sheriff said he is looking forward to forgetting all about Stephen Paddock.

“It was very hard for me to even mention his name today. I don’t want to remember this individual,” Lombardo said. “I will remember the act and the victims, but I will not remember the suspect.”

This is a developing story. Check back for updates.

Contact Henry Brean at hbrean@reviewjournal.com or 702-383-0350. Follow @RefriedBrean on Twitter. Review-Journal staff writers Rachel Crosby, Michael Scott Davidson and Katelyn Newberg contributed to this report.