Sheriff Joseph Lombardo, of the Las Vegas Police, "More than 100 investigators have spent the last 72 hours combing through the life of 64-year-old Stephen Paddock, to produce a profile of someone I will call disturbed and risky".
He says Stephen Paddock planned to survive and escape but didn't say how.
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"He never said anything to me or took any action that I was aware of that I understood as a warning that something disgusting like this was going to happen", she said in the statement.
A Chicago hotel overlooking popular music festival Lollapalooza confirmed to The Independent that someone named Stephen Paddock had booked a room during the festival, but failed to show up. Paddock's motive remains unknown.
Federal Bureau of Investigation officers and Vegas police are now investigating Paddock's actions in the hour between his shooting a security guard and being himself found dead in his hotel room.
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He said that it was hard to believe that the weapons and ammunition found in his possession were acquired by him alone.
When asked by another reporter if Paddock tried to carry out the massacre on his own, Lombardo replied, "You've got to make the assumption he had to have some help at some point".
"Paddock rented a room at the Ogden Hotel in downtown Las Vegas".
Investigators believe that Paddock used bump-stock for the attack as it modifies a semi-automatic weapon to fire at an automatic rate.
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Unfortunately, Paddock decided that he'd carry out his heinous act during the Route 91 festival in Las Vegas on October 1.