PICTURES: Shooting on Las Vegas Strip at Jason Aldean concert

Contractor Robert Walker says a prayer after placing flowers and American flag at the scene of a memorial for the victims of the mass shooting on Las Vegas Boulevard near the crime scene.

Matthew Edwards lights candles at a makeshift memorial at Sahara Avenue and Las Vegas Boulevard in Las Vegas for the victims of the mass shooting.

Flowers, candles and toys are left at a makeshift memorial site on Las Vegas Boulevard on Tuesday, Oct. 3, 2017, in Las Vegas. A gunman opened fire on an outdoor music concert on Sunday killing dozens and injuring hundreds. (AP Photo/Chris Carlson)  (Chris Carlson / AP)

Flowers and candles are left at a makeshift memorial site on Las Vegas Boulevard on Tuesday, Oct. 3, 2017, in Las Vegas. A gunman opened fire on an outdoor music concert on Sunday killing dozens and injuring hundreds. (AP Photo/Chris Carlson)  (Chris Carlson / AP)

Flowers and signs are seen at a memorial site on Tuesday, Oct. 3, 2017 in Las Vegas. A gunman opened fire on an outdoor music concert on Sunday. (AP Photo/Chris Carlson)  (Chris Carlson / AP)

Investigators work at a festival grounds across the street from the Mandalay Bay Resort and Casino on Tuesday, Oct. 3, 2017, in Las Vegas. Authorities said Stephen Craig Paddock broke windows on the casino and began firing with a cache of weapons, killing dozens and injuring hundreds at the music festival on Sunday. (AP Photo/Marcio Jose Sanchez)  (Marcio Jose Sanchez / AP)

An investigator works in the room at the Mandalay Bay Resort and Casino where a gunman opened fire from on a music festival Tuesday, Oct. 3, 2017, in Las Vegas. The gunman killed dozens and injuring hundreds at the festival. (AP Photo/Marcio Jose Sanchez)  (Marcio Jose Sanchez / AP)

University of Nevada Las Vegas students Raymond Lloyd, right, and Karla Rodriguez take part in a vigil Monday, Oct. 2, 2017, in Las Vegas.

Investigators work at a festival grounds across the street from the Mandalay Bay Resort and Casino on Tuesday, Oct. 3, 2017, in Las Vegas. Authorities said Stephen Craig Paddock broke windows on the casino and began firing with a cache of weapons, killing dozens and injuring hundreds at the music festival. (AP Photo/Marcio Jose Sanchez)  (Marcio Jose Sanchez / AP)

Debris is strewn through the scene of a mass shooting at a music festival near the Mandalay Bay resort and casino on the Las Vegas Strip, Monday, Oct. 2, 2017, in Las Vegas. (AP Photo/John Locher)  (John Locher / AP)

People run from the Route 91 Harvest country music festival after apparent gun fire was hear on October 1, 2017 in Las Vegas, Nevada.

A cowboy hat lays in the street after shots were fired near a country music festival on October 1, 2017 in Las Vegas, Nevada.

People scramble for shelter at the Route 91 Harvest country music festival after apparent gun fire was heard on October 1, 2017 in Las Vegas, Nevada.

People run for cover at the Route 91 Harvest country music festival after apparent gun fire was heard on October 1, 2017 in Las Vegas, Nevada. There are reports of an active shooter around the Mandalay Bay Resort and Casino.

People run from the Route 91 Harvest country music festival after apparent gun fire was hear on October 1, 2017 in Las Vegas, Nevada.

A person takes cover at the Route 91 Harvest country music festival after apparent gun fire was heard on October 1, 2017 in Las Vegas, Nevada. There are reports of an active shooter around the Mandalay Bay Resort and Casino.

A man in a wheelchair is taken away from the Route 91 Harvest country music festival after apparent gun fire was heard on October 1, 2017 in Las Vegas, Nevada.

Police officers stand by as medical personnel tend to a person on Tropicana Ave. near Las Vegas Boulevard after a mass shooting at a country music festival nearby on October 2, 2017 in Las Vegas, Nevada.

Police officers point their weapons at a car driving down closed Tropicana Ave. near Las Vegas Boulevard after a reported mass shooting at a country music festival nearby on October 2, 2017 in Las Vegas, Nevada.

A woman sits on a curb at the scene of a shooting outside of a music festival along the Las Vegas Strip, Monday, Oct. 2, 2017, in Las Vegas.

Las Vegas Metropolitan Police officers patrol Tropicana Ave. near Las Vegas Boulevard after a mass shooting at a country music festival nearby on October 2, 2017 in Las Vegas, Nevada.

A Las Vegas Metropolitan Police officer stands on Tropicana Ave. near Las Vegas Boulevard after a mass shooting at a country music festival nearby on October 2, 2017 in Las Vegas, Nevada.

Police and rescue personnel gather at the intersection of Las Vegas Boulevard and Tropicana Ave. after a mass shooting at a country music festival nearby on October 2, 2017 in Las Vegas, Nevada.

Police and rescue personnel gather at the intersection of Las Vegas Boulevard and Tropicana Ave. after a reported mass shooting at a country music festival on October 2, 2017 in Las Vegas, Nevada.

Police and rescue personnel gather at the intersection of Las Vegas Boulevard and Tropicana Ave on October 1, 2017 in Las Vegas, Nevada. A gunman has opened fire on a music festival in Las Vegas, leaving dozens dead and more than 100 injured.

People take cover at the Route 91 Harvest country music festival after apparent gun fire was heard on October 1, 2017 in Las Vegas, Nevada.

Police officers take cover near the scene of a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip, Sunday, Oct. 1, 2017, in Las Vegas.

People run from the New York New York during an active shooter situation on the Las Vegas Stirp in Las Vegas Sunday, Oct. 1, 2017.

Las Vegas police run by a banner on the fence at the Route 91 Harvest country music festival grounds after a active shooter was reported on October 2, 2017 in Las Vegas, Nevada.

A wounded woman is moved outside the Tropicana during an active shooter situation on the Las Vegas Strip in Las Vegas Sunday, Oct. 1, 2017.

People wait as the Tropicana Las Vegas goes on lockdown during an active shooter situation on the Las Vegas Strip in Las Vegas on Sunday, Oct. 1, 2017.

Las Vegas Metropolitan Police Department officers stand near an ambulance as medical personnel treat a person in the parking lot of the Hooters Casino Hotel after a mass shooting at a country music festival nearby on October 1, 2017 in Las Vegas, Nevada.

A Las Vegas Metropolitan Police Department officer stands in the intersection of Las Vegas Boulevard and Tropicana Ave. after a mass shooting at a country music festival nearby on October 2, 2017 in Las Vegas, Nevada.

Police form a perimeter around the road leading to the Mandalay Hotel (background) after a gunman killed at least 50 people and wounded more than 200 others when he opened fire on a country music concert in Las Vegas, Nevada on October 2, 2017.

Police officers rush into the Mandalay Bay resort and casino during a shooting near the casino on the Las Vegas Strip, Sunday, Oct. 1, 2017, in Las Vegas.

A wounded woman is moved outside the Tropicana during an active shooter situation on the Las Vegas Strip in Las Vegas Sunday, Oct. 1, 2017. Multiple victims were being transported to hospitals after a shooting late Sunday at a music festival on the Las Vegas Strip.

People hug and cry outside the Thomas & Mack Center after a mass shooting at the Route 91 Harvest country music festival on October 2, 2017 in Las Vegas, Nevada.

Police form a perimeter around the road leading to the Mandalay Hotel (background) after a gunman killed at least 50 people and wounded more than 400 others when he opened fire on a country music concert in Las Vegas, Nevada on October 2, 2017.

Police form a perimeter around the road leading to the Mandalay Hotel (background) after a gunman killed at least 50 people and wounded more than 400 others when he opened fire on a country music concert in Las Vegas, Nevada on October 2, 2017.

Broken windows are seen on the 32nd floor of the Mandalay Bay Resort and Casino after a lone gunman opened fired on the Route 91 Harvest country music festival on October 2, 2017 in Las Vegas, Nevada.

Broken windows are seen on the 32nd floor of the Mandalay Bay Resort and Casino after a lone gunman opened fired on the Route 91 Harvest country music festival on October 2, 2017 in Las Vegas, Nevada.

Police vehicles block a street corner after a deadly shooting at a music festival Monday, Oct. 2, 2017, in Las Vegas.

Police block a road on the Las Vegas Strip near the Mandalay Bay hotel and casino shortly after sunrise Monday, Oct. 2, 2017, in Las Vegas.

Concert-goers wait for a ride outside the Thomas & Mack Center after a mass shooting at a country music festival on October 2, 2017 in Las Vegas, Nevada. People who could not go to hotel-casinos that were closed after the shooting temporarily stayed at the center.

Police vehicles block a street after sunrise Monday, Oct. 2, 2017, in Las Vegas. A mass shooting occurred late night Sunday at a music festival on the Las Vegas Strip.

Police vehicles block a street after sunrise Monday, Oct. 2, 2017, in Las Vegas. A mass shooting occurred late night Sunday at a music festival on the Las Vegas Strip.

Crime scene tape surrounds the Mandalay Hotel (background) after a gunman killed at least 50 people and wounded more than 200 others when he opened fire on a country music concert in Las Vegas, Nevada on October 2, 2017.

Police return to their vehicles after patrolling around the Mandalay Hotel where a gunman killed at least 50 people and wounded more than 200 others when he opened fire on a country music concert in Las Vegas, Nevada on October 2, 2017.

Law enforcement speak to people outside a gate for the Route 91 Harvest concert venue on the Las Vegas Strip Monday, Oct. 2, 2017, in Las Vegas. A mass shooting occurred late night Sunday at the music festival.