Debris is scattered on the ground Monday, October 2, at the site of a country music festival held this past weekend in Las Vegas. Dozens of people were killed and hundreds were injured Sunday when a gunman opened fire on the crowd. Police said the gunman fired from the Mandalay Bay hotel, several hundred feet southwest of the concert grounds. It is the deadliest mass shooting in modern US history. John Locher/AP

Broken windows of the Mandalay Bay are seen early in Las Vegas on Monday. Police said the gunman fired on the crowd from the 32nd floor of the hotel. John Locher/AP

People cross a street near the Las Vegas Strip just after sunrise on Monday. Thousands were attending the music festival, Route 91 Harvest, when the shooting started. Ronda Churchill/AP

People embrace outside the Thomas & Mack Center after the shooting. Ethan Miller/Getty Images

Police arrive at the Sands Corporation plane hangar where some people ran to safety after the shooting. Powers Imagery/Invision/AP

A woman cries while hiding inside the Sands Corporation plane hangar. Powers Imagery/Invision/AP

Concertgoers dive over a fence to take cover from gunfire on Sunday night. David Becker/Getty Images

Police take position outside the Mandalay Bay. David Becker/Getty Images

A man lays on top of a woman as others flee the festival grounds. The woman reportedly got up from the scene. David Becker/Getty Images

People are seen on the ground after the gunman opened fire. David Becker/Getty Images

People run from the festival grounds. David Becker/Getty Images

A woman is moved outside the Las Vegas Tropicana resort. Multiple victims were being transported to hospitals in the aftermath of the shooting. Chase Stevens/AP

People are searched by police at the Tropicana. Chase Stevens/AP

An ambulance leaves the intersection of Las Vegas Boulevard and Tropicana Avenue. Ethan Miller/Getty Images

A man in a wheelchair is evacuated from the festival after gunfire was heard. David Becker/Getty Images

Victims of the shooting are tended to in the street. Ethan Miller/Getty Images

Concertgoers help an injured person at the scene. David Becker/Getty Images

People gather around a victim outside the festival grounds. David Becker/Getty Images

A couple huddles after shots rang out at the festival. David Becker/Getty Images

An injured woman is helped at the Tropicana. Chase Stevens/AP

Police and emergency responders gather at the intersection of Las Vegas Boulevard and Tropicana Avenue. Ethan Miller/Getty Images

A police officer takes position behind a truck. John Locher/AP

A crowd takes cover at the festival grounds. David Becker/Getty Images

Police officers advise people to take cover in the wake of the shooting. John Locher/AP

People tend to a victim at the festival grounds. David Becker/Getty Images

Police stand at the scene of the shooting. John Locher/AP

A woman sits on a curb at the scene of the shooting. John Locher/AP

Police are deployed to the scene. John Locher/AP