LAS VEGAS—Police and FBI agents, chasing down more than 1,000 dead-end leads since a gunman killed 58 people in Las Vegas, are seeking more help from the public in solving the central mystery of their investigation—the shooter’s motive.
Clark County Undersheriff Kevin McMahill said investigators remain largely in the dark about what drove retired real estate investor and high-stakes gambler Stephen Paddock to carry out the deadliest mass shooting in modern U.S. history.