No Clear Motive Found for 2017 Las Vegas Massacre

The site of the Route 91 music festival mass shooting is seen outside the Mandalay Bay Resort and Casino in Las Vegas, Nevada on Oct. 2, 2017. Lucy Nicholson/Reuters

Police have uncovered no clear motive for the gunman who killed 58 people at outdoor concert in Las Vegas last year, in the deadliest mass shooting in modern U.S. history, a sheriff said on Friday.