Police still can't figure out a motive for the Las Vegas shooting

Investigators still do not know why Stephen Paddock shot and killed 58 people during an outdoor music festival in Las Vegas last October, CBS News reports. In a press conference Friday, authorities conceded that three months of investigation had not yielded any findings on Paddock's motivations, though Clark County Sheriff Joe Lombardo did emphasize that Paddock acted alone and that his girlfriend — who was at one point suspected of helping him — would not be charged with any crime.

During the press conference, Lombardo also discussed a newly released 81-page report that examined Paddock's actions in the months leading up to the shooting, which was the deadliest in modern American history. The evidence indicated Paddock had been planning an attack for a while; investigators found he purchased over 50 firearms in the 12 months leading up to the shooting, and that he had studied the response strategies of various law enforcement departments.

Lombardo noted that "disturbing" internet searches Paddock had conducted indicated he may have considered carrying out the attack at other concerts or at beaches in California, CBS News reported. Investigators also found child pornography on Paddock's computer.

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Read the full report at the Las Vegas Review Journal.