LAS VEGAS—The girlfriend of the Las Vegas gunman who killed 58 people and himself in the deadliest mass shooting in modern U.S. history was questioned by the FBI on Wednesday and said she had no idea he was “planning violence against anyone.”

A candlelight vigil is held at Zack Bagans Haunted Museum in remembrance of victims following the mass shooting along the Las Vegas Strip in Las Vegas, Nevada on Oct. 3, 2017. REUTERS/Mike Blake