Note in Las Vegas gunman's hotel room included details of bullet trajectory

Air Force One departs Las Vegas past the broken windows on the Mandalay Bay hotel where shooter Stephen Paddock conducted his mass shooting along the Las Vegas Strip in Las Vegas

Las Vegas gunman had booked a hotel near Lollapalooza

Investigators are sceptical about the claim by Stephen Paddock's girlfriend that she knew nothing about his deadly plans. The note can be seen on the table at far right.

Paddock unleashed gunfire on Sunday from the 32nd floor of the Mandalay Bay hotel casino on the Las Vegas Strip, killing 58 and injuring almost 500 people.

Law enforcement officials briefed on the investigation confirmed to ABC News on Sunday that the note found on Paddock's hexagon-shaped nightstand contained such numerical figures.

In their effort to find any hint of his motive, investigators were looking into whether he was with a prostitute days before the shooting, were scrutinizing cruises he took and were trying to make sense of a cryptic note with numbers jotted on it found in his hotel room, a federal official said.

"I could see on it he had written the distance, the elevation he was on, the drop of what his bullet was going to be for the crowd", Newton said in a clip from the the episode, which will be televised on Sunday night.

Paddock, a reclusive 64-year-old high-stakes gambler, rained bullets on the crowd at a country music festival from his 32nd-floor hotel suite, killing 58 and wounding hundreds before taking his own life. Inside Paddock's valet-parked auto, there were 50 pounds of a chemical compound known as Tannerite - a popular target material for shooters that explodes when hit by a bullet.

Police also say Paddock may have planned to escape the scene.

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He killed himself as police closed in.

Newton described setting foot into the room after blowing up the door with an explosive.

"Very eerie. Yeah, the dust from the explosive breach".

Investigators have chased 1,000 leads and examined Paddock's politics, finances, any possible radicalisation and his social behaviour - typical investigative avenues that have helped uncover the motive in past shootings. "And then you have the flashing lights", Newton said.

They have been closely scrutinising his trips and other activities in a bid to understand why he chose to fire on a crowd of country music fans from the Mandalay Bay Hotel.

ABC News reported that investigators believe Paddock may have also scouted sites in Boston.

Paddock's brother said the gunman made at least $2 million when the two sold their real estate business a few years ago.

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