The suspected gunman behind the deadliest mass shooting in U.S. history set up surveillance cameras in and around his Las Vegas hotel room and recorded himself firing at a crowd of concertgoers.

ABC News reports that Stephen Paddock mounted a camera in his room on the 32nd floor of the Mandalay Bay Resort & Casino, believed to be for the purpose of filming himself shooting at a crowd of thousands who were attending the Route 91 Harvest Festival.

According to the Daily Mail, Paddock also set up cameras in the hallway outside of his hotel room, believed as a way to alert himself to oncoming law enforcement agents. Authorities found Paddock dead of a self-inflicted gunshot wound when they breached the hotel room.

The Daily Mail report also states that Paddock had lived in 27 different homes as an adult — all in Nevada, Florida, or Texas.

As CrimeOnline previously reported, authorities found a massive arsenal of dozens of firearms between Paddock’s hotel room and his home in Mesquite, Nevada.

Authorities are still attempting to determine a motive, but found some suspicious financial transactions. Paddock, a high-stakes gambler, wired $100,000 to the Philippines the week before the shooting. His live-in girlfriend of only a few months, Marilou Danley, is reportedly a native of the Philippines and was in that country on the day of the deadly massacre.

[Feature photo: Associated Press]