The man that shot and killed 58 people has spent decades buying weapons, police have revealed.
Stephen Paddock injured nearly 500 on Monday after opening fire at a country music fesitval on the Las Vegas strip.
Authorities say the Las Vegas shooter had 1,600 rounds of ammunition and several containers of an explosive commonly used in target shooting that totaled 22 kgs in his car.
Sheriff Joseph Lombardo told reporters that he didn't know what Paddock was planning with the explosives, if anything.
Lombardo also said none of the cameras Paddock put up in the hotel room where he unleashed gunfire onto a concert crowd were recording.
Authorities say he set up cameras in the peephole of the door and outside the room to watch for police closing in on him.
The sheriff also gave a timeline of the shooting. The first shots began at 10:05 p.m. (local time) and ended 10 minutes later.