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Breaking news update, 5:50 p.m.:

Las Vegas mass shooter Stephen Paddock rented a room in downtown Las Vegas through Airbnb at The Ogden around the same time as the Life is Beautiful concert, Clark County Sheriff Joseph Lombardo said Wednesday

The Life is Beautiful concert took place from September 22 to 25.

Lombardo said investigators have recovered video from the Ogden to review Paddock's actions while he was there.

Previous story, last updated at 5 p.m.:

Almost three days after the deadliest mass shooting in modern American history, investigators appear no closer to answering the question: Why?

Why did Stephen Paddock, a 64-year-old retired accountant, fire from his 32nd-floor hotel window into a crowd of 22,000 concertgoers in the heart of Las Vegas?

Why did he continue firing with an arsenal of weapons for nine to 11 minutes, leaving at least 58 people dead and more than 500 with gunshot wounds or stampede injuries?

At this point, Paddock's motive and aims remain a mystery to investigators. FBI Deputy Director Andrew McCabe told CNBC on Wednesday that the lack of a clear motive was a "surprise" in this mass shooting.

"This one is somewhat different than many of the ones we've dealt with in the past, because we don't have any immediately accessible thumbprints that would indicate the shooter's ideology or motivation, or really what compelled him to get there," McCabe said.

Police believe Paddock acted alone when he sprayed gunfire on the crowd at the Route 91 Harvest festival.

McCabe told CNN that the FBI was going through Paddock's communications, financial records, associates and video surveillance -- anything to try to piece together the puzzle of his motive.

"We will look at every one of those lanes, pull every possible thread," he said.

Authorities are hoping to find answers when Paddock's girlfriend, Marilou Danley, is questioned on Wednesday. She was out of the country during the shooting and returned to the United States on Tuesday night from the Philippines.

Clark County Sheriff Joseph Lombardo told reporters Wednesday just after 9 a.m. local time that Danley would be questioned in the next half hour at the FBI's Los Angeles field office.

In an interview with CNN affiliate Seven Network Australia, Danley's sisters said that Danley did not know about the shooting and was "sent away" before the attack. Still, one sister hoped that her perspective could provide some clues as to what happened.

"Of all the people that they have interviewed ... no one can put the puzzles together -- no one -- except Marilou, because Steve is not here to talk anymore," Danley's sister said. "Only Marilou can maybe help to solve this investigation and what and why he's done this."

President Donald Trump, who visited Las Vegas victims, first responders and heroes on Wednesday, offered his own analysis of the shooter's motives.

"He's a sick, demented man," Trump said. "The wires are screwed up."

Paddock's violent transformation has mystified everyone -- his brother, investigators and the families he victimized included.

The 64-year-old, retired, twice-divorced accountant -- who at one time had jobs at the US Post Office and the IRS, a representative of the Office of Personnel Management told CNN -- had no significant criminal history and was previously unknown to police.

President Trump said that America was a "nation in mourning" on Wednesday and praised the work of first responders, hospital staff, local leaders and the people of Las Vegas.

"Words cannot describe the bravery that the whole world witnessed on Sunday night," he said. "Americans defied death and hatred with love and with courage."

"When ... the worst of humanity strikes, and strike it did, the best of humanity responds," Trump said. "Parents and spouses used their own bodies as shields to protect their loved ones. Americans dashed into a hail of bullets to rescue total strangers."

Separately, a GoFundMe for the victims of Las Vegas has raised almost $9 million as of Wednesday afternoon.

Shooter bought 33 firearms

The evidence laid out by investigators so far shows Paddock meticulously planned the shooting.

He purchased 33 firearms, mostly rifles, between October 2016 and September 2017, according to an ATF spokesperson.

The gunman checked into the room days in advance, stocked a cache of weapons there and set up cameras inside his hotel suite and in the hallway.

The first call reporting shots fired came at 10:08 p.m. Sunday, and the gunfire didn't stop until 10:19 p.m., Clark County Undersheriff Kevin McMahill said. The shooting continued off and on for nine to 11 minutes, he said.

Paddock had an arsenal of weapons in his hotel suite, including bump-fire stocks -- legal devices that enable a shooter to fire bullets rapidly, similar to an automatic rifle.

He had outfitted 12 of his firearms with the bump stocks, said the Bureau of Alcohol, Tobacco, Firearms and Explosives.

The killer also had cameras set up inside and outside the suite. Police don't know if the devices were transmitting -- the FBI is investigating their use -- but the Clark County sheriff said he thinks Paddock might have used them to watch for people approaching his room. One camera looked out the peephole on the suite's door.

The hail of gunfire stopped when security guards approached Paddock's room at the Mandalay Bay Resort and Casino, McMahill said. Paddock turned his attention to those outside his door and fired, wounding one of them.

The guard was "very heroic" and provided police with information about the shooter's location, McMahill said. When officers entered the hotel room, they found Paddock dead. Authorities believe he killed himself.

Wounded security guard recovering

David Hickey, president of the union representing the hotel's officers, identified the wounded guard on Wednesday as Jesus Campos.

Paddock had barricaded the stairwell doors and pointed his makeshift cameras system toward the elevator as Campos approached, said Hickey, head of the International Union, Security, Police and Fire Professionals of America.

Campos, who was shot in the right leg, was out of the hospital on Wednesday. He was expected to have a round removed from his leg at a later date, Hickey said.

The union has seventeen armed officers at Mandalay Bay. Hickey was uncertain if Campos was armed.

Shooter's girlfriend back in United States

Danley, the gunman's girlfriend, entered the Philippines September 15 and again on September 25, traveling on her Australian passport, said Maria Antoinette Mangrobang, spokeswoman for the Bureau of Immigration in the Philippines.

Danley had lived in Mesquite, Nevada, with Paddock. She was out of the country during the shooting, police said.

Mangrobang said authorities in the Philippines have been communicating with the FBI and the US Department of Homeland Security.

Paddock had wired $100,000 to the Philippines, a law enforcement source said, but officials haven't been able to say exactly when the money transfer took place or who was the recipient. The FBI is working with Philippine authorities to determine details.

Danley's sisters, speaking to CNN affiliate Seven Network Australia, said that Danley didn't know anything about the shooting ahead of time and that Paddock "sent her away" before the attack.

"She was sent away so that she will be not there to interfere with what he's planning," one sister said.

The sisters, who were not identified by name and whose faces were blurred, added that Danley would willingly cooperate with investigators.

Attorney Matt Lombard is working with Danley, according to Lori Stanton with Lombard Law. Stanton said Lombard is expected to put out a statement later Wednesday.

Assault-style rifles strewn across room

The UK's Daily Mail newspaper published several photos taken in Paddock's room after the shooting.

They show semi-automatic assault-style rifles on the floor and on furniture. Stacks of ammunition magazines used in rifles can also be seen. One photo shows Paddock's legs splayed on the floor near several weapons, apparently after he killed himself. Police said they're investigating the source of the leaked photos.

The rifles in the photographs were far from the gunman's only weapons. A total of 47 guns have been recovered from three locations: Paddock's hotel room and his two Nevada homes in Verdi and Mesquite.

The guns were bought in Nevada, Utah, California and Texas, said Jill Snyder, special agent in charge of ATF field division in San Francisco.

Authorities also found thousands of rounds of ammunition in Paddock's Mesquite home, and an ingredient used in explosives was discovered inside the killer's car.

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