The man who unleashed terror on the Las Vegas Strip brought a hammer to break the windows, 23 firearms to inflict the damage and video cameras to capture officers’ arrival — all of which point to a calculated plan by a “disturbed and dangerous” individual who lived a “secret life,” police said Wednesday.

As investigators try to unlock a motive, they’re looking into whether 64-year-old Stephen Paddock also took extraordinary measures to make his life a mystery. After all, his brother and ex-wife seem equally baffled by his actions, Metro Police Sheriff Joe Lombardo said.

“So don’t you think the concealment of his history of his life was well thought out?” Lombardo said Wednesday evening. “And it’s incumbent upon us as professionals to figure that out.”

Three days after the deadly rampage that claimed 58 lives and injured 489 others, authorities urged patience as they untangle the clues that might offer insight into the mind of the killer, who authorities also intimated Wednesday had a plan to survive before he committed suicide.

“Usually there’s a telltale sign associated with these types of actions — reclusive, a plethora of things associated with this mindset — and we have not found that yet,” Lombardo said.

Police and the FBI want the public to know they’ll continue searching for answers until they learn what motivated Paddock to open fire on a crowd of 22,000 people attending a country music festival from the 32nd floor of the Mandalay Bay Hotel and Casino. FBI Special Agent in Charge Aaron Rouse said the agency is pursuing multiple leads across the country and world.

“Our resolve is firm,” Rouse said. “We will get to the bottom of all of this, no matter how long it takes.”

Lombardo said that while police have evidence that the suspect was gambling prior to the shooting, they have not seen proof that an accomplice or companion was with him. But the sheriff said it was hard to believe that he carried out the attack entirely on his own.

“You look at the weapon obtaining, the different amounts of tannerite (commonly used in exploding shooting targets) available, do you think this was all accomplished on his own self value, face value,” Lombardo said. “You’ve got to make the assumption that he had to have some help at some point.”

His live-in girlfriend, Marilou Danley, has denied any knowledge or complicity in the attack, describing Paddock as “a kind, caring, quiet man” and adding that “I loved him and I hoped for a quiet future together with him.” FBI officials interviewed her Wednesday in Los Angeles.

“He never said anything to me, or took any action that I was aware of, that I understood in any way to be a warning that something horrible like this was going to happen,” Danley said in a statement read by her attorney during a brief press conference in Los Angeles. “It never occurred to me in any way whatsoever that he was planning violence against anyone.”

Her statement explained that Paddock told her about two weeks ago that he found a cheap ticket so she could visit her relatives and friends in the Philippines, and wired her money, telling her to buy a house for herself and her family.

“I was grateful, but honestly I was worried that first, the unexpected trip home, and then the money was a way of breaking up with me,” she said in the statement.

Danley added that she was cooperating with police and was “devastated” by the shooting.

“I have faith in God, and I will continue to pray for everyone who has been harmed or hurt,” she said. “I am a mother and grandmother and my heart breaks for all those who have lost loved ones.”

Lombardo largely dodged questions about Danley, saying he hadn’t been fully briefed on the interview. But he did make this observation: “I think any person put in her situation would probably answer the same way.”

Police are also exploring whether Paddock had surveilled or been targeting other venues.

Lombardo confirmed Wednesday that Paddock used Airbnb to rent a room at the Ogden, a high-rise condominium building in downtown Las Vegas overlooking the annual Life Is Beautiful music festival, which was held the weekend before last. He was unable to specify why Paddock rented the room and said police are reviewing video footage from the property.

He also said it was “amazing” that the security guard who assisted police as they attempted to locate Paddock on the 32nd floor of the Mandalay Bay Hotel and Casino didn’t sustain additional injuries. The gunman fired more than 200 rounds into the hallway outside the hotel suite, Lombardo said.

Investigators have formalized a timeline of events, which began with shots fired by the suspect at 10:05 p.m. Sunday. Seven minutes later, officers had arrived on the 31st floor of the hotel and realized the gunfire was coming from directly above them.

Paddock fired his last shots at 10:15 p.m., and as officers were arriving on the 32nd floor, the hotel security guard told police he had been shot.

Eight officers continued moving down the hallway, clearing rooms and looking for injured people. They considered it a barricade situation at this point given the absence of gunfire.

“Keep in mind that the delay was not undo,” Lombardo said. “It was purposeful, and no shots were being heard by the suspect at this point.”

Officers deployed the first breach at 11:20 p.m. and entered the shooter’s room, where they found him dead on the ground. Seven minutes later, they set off another breach to open a second door to another room in the suite, which did not have anyone else inside.

The gunman’s suicide, however, may not been part of his original plan. Lombardo said investigators found evidence in the room indicating that Paddock planned to survive the incident, although the sheriff declined to provide details.

Paddock did not leave a suicide note, he said.

Evidence collection continues at the festival grounds and hotel room. Lombardo said concertgoers who abandoned personal belongings in their rush to escape likely won’t be able to retrieve those items for four to five days.

The sheriff apologized for that being “troublesome” to those involved but said investigators must diligently process the scene.