An estimated 22,000 people were attending the Route 91 Harvest festival when Paddock opened fire. The investigators are working with the assumption that he had some help at some point. Paddock's motive remains unknown.
David Newton described his first impressions of Paddock's hotel room as they moved in amid the flashing lights of a fire alarm set off by an explosive, which had been used to blow through the door. He also rented an apartment in another Las Vegas high-rise over another music festival featuring Chance the Rapper on the weekend before the shooting, but it's unclear why.
MSNBC reported on Friday a mobile phone charger that did not match Paddock's phone was found in his Mandalay Bay suite and it appears the keycard for his room was used to open the door when his vehicle had left the casino auto park. If he had planned to escape, he may have meant to target other events with large crowds.
Paddock booked one room starting on August 1, two days before the festival opened. His rooms at the Blackstone Hotel faced the park and were booked for Aug. 1 through Aug. 6 and Aug. 3 through Aug. 6, respectively, according to TMZ..
In total, 47 firearms were recovered from Paddock's hotel suite, his home in Mesquite, and another property associated with him in Reno, Nevada.
"It's hard to believe that one individual planned this attack and executed without anybody else knowing anything about it", McMahill said. However, there is still no evidence to indicate terrorism, such as connections to extremist groups, or an accomplice.
Meanwhile, the girlfriend of Paddock says she had no advance knowledge of what he was planning.
Stephen Paddock's girlfriend, Marilou Danley, told FBI. investigators he had mental health issues and would sometimes lie in bed crying out, "Oh, my God!"
The investigation is ongoing.