Clark County Sheriff Joe Lombardo announces the release of the Oct. 1, 2017, shooting After-Action Review with report authors Detective Stephanie Ward, left, and Capt. Kelly McMahill during a news conference at Metropolitan Police Department headquarters Las Vegas Wednesday, July 10, 2019. The report details what the department learned from the deadliest mass shooting in modern U.S. history.  (K.M. Cannon/Las Vegas Review-Journal via AP)

LAS VEGAS (AP) — Las Vegas police learned from the deadliest mass shooting in modern U.S. history to secure high-rise buildings overseeing open-air crowds and train more officers with rifles to stop a shooter in an elevated position, Clark County Sheriff Joe Lombardo said Wednesday.

Among 93 recommendations in a newly released department %href_on(file:

FILE - In this Oct. 1, 2017, file photo, police run toward the scene of a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip in Las Vegas. The head of the Las Vegas police department is scheduled to release what he calls an after-action report about the deadliest mass shooting in modern U.S. history. Clark County Sheriff Joe Lombardo says the review he'll release Wednesday, July 10, 2019, aims to show what other law enforcement agencies can learn from the shooting that killed 58 people and injured more than 850. (AP Photo/John Locher, File)
FILE - In this Aug. 3, 2018, file photo, Clark County Sheriff Joe Lombardo speaks at a news conference regarding the Oct. 1, 2017 mass shooting in Las Vegas. The head of the Las Vegas police department is scheduled to release what he calls an after-action report about the deadliest mass shooting in modern U.S. history.  Lombardo says the review he'll release Wednesday, July 10, 2019, aims to show what other law enforcement agencies can learn from the shooting that killed 58 people and injured more than 850. (AP Photo/John Locher, File)