Police said Stephen Paddock, a 64-year-old resident of Mesquite, Nevada, opened fire on a music festival crowd from the 32nd floor of the Mandalay Bay Resort and Casino, killing 58 people and injuring 530 others.
Officials revealed on Tuesday that Paddock had cameras set up inside and outside of his hotel room.
"I anticipate he was looking for anybody coming to take him into custody," Clark County Sheriff Joseph Lombardo said. Sources told ABC News the suspect utilized at least one camera outside the room possibly to monitor approaching police. Lombardo said there was a camera on a service cart in the hallway.
"FBI took all digital and electronic evidence into custody," Lombardo added.