A woman looks at the site of the Route 91 music festival mass shooting outside the Mandalay Bay Resort and Casino in Las Vegas, Nevada, U.S. October 2, 2017.

People enter the Family Assistance Center set up in the Las Vegas Convention Center, following the mass shooting at the Route 91 music festival in Las Vegas, Nevada, U.S., October 2, 2017.

Hundreds of people queue to donate blood following the mass shooting at the Route 91 music festival in Las Vegas, Nevada, U.S., October 2, 2017.

People mourn during an interfaith memorial service for victims of the Route 91 music festival mass shooting outside the Mandalay Bay Resort and Casino in Las Vegas, Nevada, U.S. October 2, 2017.

People mourn after an interfaith memorial service for victims of the Route 91 music festival mass shooting outside the Mandalay Bay Resort and Casino in Las Vegas, Nevada, U.S. October 2, 2017.

Alexander Wells, 9, attends a prayer vigil, in honor of those affected by the shooting on the Las Vegas Strip, in front of Las Vegas City Hall in Las Vegas, Nevada, U.S. October 2, 2017.

Las Vegas Mayor Carolyn Goodman speaks during a prayer vigil, in honor of those affected by the shooting on the Las Vegas Strip, in front of Las Vegas City Hall in Las Vegas, Nevada, U.S. October 2, 2017.

A man mourns during an interfaith memorial service for victims of the Route 91 music festival mass shooting outside the Mandalay Bay Resort and Casino in Las Vegas, Nevada, U.S. October 2, 2017.

Las Vegas Boulevard lights-up with with signs for the victims and first responders after a mass shooing at the Route 91 Harvest Country Music Festival in Las Vegas, Nevada, U.S., October 2, 2017.

Women walk down the Las Vegas strip after roads were closed near the site of the Route 91 music festival mass shooting outside the Mandalay Bay Resort and Casino in Las Vegas, Nevada, U.S. October 2, 2017.

People stand along a pedestrian walkway looking towards where a mass shooing at the Route 91 Harvest Country Music Festival took place last night on the Las Vegas Strip in Las Vegas, Nevada, U.S., October 2, 2017.

A woman makes a sign at a vigil on the Las Vegas strip following a mass shooting at the Route 91 Harvest Country Music Festival in Las Vegas, Nevada, U.S., October 2, 2017. Picture taken October 2, 2017.

People gather at a vigil on the Las Vegas strip following a mass shooting at the Route 91 Harvest Country Music Festival in Las Vegas, Nevada, U.S., October 3, 2017.

A woman lights candles at a vigil on the Las Vegas strip following a mass shooting at the Route 91 Harvest Country Music Festival in Las Vegas, Nevada, U.S., October 2, 2017. Picture taken October 2, 2017.

Personal belongings lay tossed aside on the fair grounds following the mass shooing at the Route 91 Harvest Country Music Festival on the Las Vegas Strip in Las Vegas, Nevada, U.S., October 3, 2017.

Personal belongings lay tossed aside on the fair grounds following the mass shooing at the Route 91 Harvest Country Music Festival on the Las Vegas Strip in Las Vegas, Nevada, U.S., October 3, 2017.

A police car patrols behind the stage of the Route 91 Harvest Country Music Festival on the Las Vegas Strip in Las Vegas, Nevada, U.S., October 3, 2017.

A request for blood donations appears on a sign for the Aria Resort and Casino following a mass shooting at the Route 91 Festival in Las Vegas, Nevada, U.S., October 2, 2017.

People sing during a prayer vigil, in honor of those affected by the shooting on the Las Vegas Strip, in front of Las Vegas City Hall in Las Vegas, Nevada, U.S. October 2, 2017.

People mourn during an interfaith memorial service for victims of the Route 91 music festival mass shooting outside the Mandalay Bay Resort and Casino in Las Vegas, Nevada, U.S. October 2, 2017.

A candlelight vigil is pictured on the Las Vegas strip following a mass shooting at the Route 91 Harvest Country Music Festival in Las Vegas, Nevada, U.S., October 2, 2017. Picture taken October 2, 2017.

A condolence sign is seen near the site of the Route 91 music festival mass shooting outside the Mandalay Bay Resort and Casino in Las Vegas, Nevada, U.S. October 2, 2017.

Two broken windows are seen at The Mandalay Bay Resort and Casino following a mass shooting at the Route 91 Festival in Las Vegas, Nevada, U.S., October 2, 2017. REUTERS/Mike Blake

People mourn during an interfaith memorial service for victims of the Route 91 music festival mass shooting outside the Mandalay Bay Resort and Casino in Las Vegas, Nevada, U.S. October 2, 2017.

The scene in front of the stage following a mass shooing at the Route 91 Harvest Country Music Festival on the Las Vegas Strip in Las Vegas, Nevada, U.S., October 2, 2017.

Morning light reflects off the Mandalay Bay hotel and the broken windows where shooter Stephen Paddock conducted his shooting spree from the 32nd floor in Las Vegas, Nevada, U.S., October 3, 2017.

A handbag is seen on the street next to the site of the Route 91 music festival mass shooting outside the Mandalay Bay Resort and Casino in Las Vegas, Nevada, U.S. October 2, 2017.