Boston Police said they're aware of the reports and are working with federal authorities to determine the extent of the research that was done and what Paddock's plans may have been.
According to NBC News, who cited "multiple senior law enforcement officials briefed on the investigation", Paddock may have looked into another music festival in Las Vegas and scouted sites in Boston and Chicago, though there's no evidence to suggest he actually traveled to the latter two cities. The Blackstone confirmed in a statement that rooms were booked in Paddock's name during Lollapalooza but that he did not stay there on those dates. "As you saw earlier this week the city conducts extensive public safety planning and training around major events, in close coordination with our law enforcement partners, to ensure public safety". Paddock specifically requested rooms be a "view room" overlooking Grant Park, which is where the annual concert is held.
The gunman, who slaughtered 58 people and injured 489, had allegedly booked two hotelrooms overlooking the festival area where 400,000 people gathered over four days in the beginning of August. Both rooms had an August 6th checkout which is when the festival ends. It's been attended by celebrities and even Malia Obama. The Mesquite, Nevada man killed 59 people Sunday night and wounded more than 500 others at a music festival, firing high-powered rifles from his 32nd-floor room at the Mandalay Bay Resort & Casino in what was the deadliest mass shooting in modern US history.
TMZ says Paddock, 64, never showed up for his bookings at the hotel.
He said Paddock lived a "secret life" and 'meticulously planned on the worst domestic attack in United States history'.
Matt Finn is a Fox News correspondent based in the Chicago bureau.