The Daily

At least 12 of the weapons found in the hotel suite used by the gunman who killed 58 people in Las Vegas on Sunday had been modified. He used a device called a bump stock, which enables a semiautomatic rifle to fire faster, and can be purchased online. Guest: C. J. Chivers, a New York Times investigative reporter and Marine veteran. For more information on today’s episode, visit nytimes.com/thedaily.