"I could see on it he had written the distance, the elevation he was on, the drop of what his bullet was gonna be for the crowd", David Newton, one of the three police officers who stormed into Paddock's hotel suite on the 32nd floor of the Mandalay Bay hotel overlooking the crowd gathered across the street, said in an interview on CBS News' program "60 Minutes" that aired on Sunday".
The FBI announced that billboards would go up around the city asking anyone with information to dial 800-CALL-FBI. "And that looked straight, like, out of a movie, you know?" "We will not stop until we have the truth".
Paddock, 64, fired indiscriminately from his upper-level room at the Mandalay Bay hotel casino at people attending a country music festival below.
Before Rouse's promise, Clark County Undersheriff Kevin McMahill disclosed that the authorities had probed Stephen Paddock's personal life, political beliefs, social behavior and economic habits, but had not found clear motive for the violence.
The region, where Isis and other jihadi groups have a presence in some areas, may be of interest to security services because of speculation Paddock became radicalised.
Las Vegas shooter Stephen Paddock had visited the Middle East during a series of cruises, police have revealed.
Paddock's brother said the gunman made at least $2 million when the two sold their real estate business a few years ago.
"The lack of a social media footprint is likely intentional", said Erroll Southers, director of homegrown violent extremism studies at the University of Southern California.
The note has not shed any light on the gunman's motives, which authorities are yet to uncover almost a week after the deadliest mass shooting in recent U.S. history. They confirm that they found the cryptic note but that they have no idea "what those numbers are or mean".
Authorities say Paddock, a 64-year-old retired accountant, meticulously planned the attack that killed 58 people and wounded 489 others at a country music festival on October 1.
McMahill confirmed at the press briefing which live showed online that there was no other shooter in Paddock's hotel room, and there's no evidence so far anyone else used his room key or anyone else was with him at the resort in the days before the shooting.