The brother of the man who killed at least 50 people at an outdoor music festival on the Las Vegas Strip says he’s “completely dumbfounded” by the shooting, which is the deadliest in modern U.S. history.

In a brief interview with the Orlando Sentinel, Eric Paddock says he can’t understand what happened. He also said he’s made a statement to police.

Country music star Jason Aldean was performing Sunday night at the end of the three-day Route 91 Harvest Festival when the gunman opened fire from inside the Mandalay Bay Hotel and Casino.

Authorities say 64-year-old Stephen Craig Paddock killed himself after the shooting. Police have not yet determined a motive.

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

David Becker, Getty Images People run from the Route 91 Harvest country music festival after apparent gun fire was heard on Oct. 1, 2017 in Las Vegas, Nevada. There are reports of an active shooter around the Mandalay Bay Resort and Casino.

Las Vegas police stand guard along the streets outside the festival grounds of the Route 91 Harvest on Oct. 1, 2017 in Las Vegas, Nevada. There are reports of an active shooter around the Mandalay Bay Resort and Casino.



John Locher, The Associated Press Police officers advise people to 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.

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

David Becker, Getty Images A man lays on top of a woman as others flee the Route 91 Harvest country music festival grounds after a active shooter was reported on Oct. 1, 2017 in Las Vegas, Nevada. The photographer witnessed the man help the woman up and they walked away. Injuries are unknown.



David Becker, Getty Images A person lies on the ground covered with blood at the Route 91 Harvest country music festival after apparent gun fire was heard on Oct. 1, 2017 in Las Vegas, Nevada.

Chase Stevens, Las Vegas Review-Journal via AP 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. Multiple victims were being transported to hospitals after a shooting late Sunday at a music festival on the Las Vegas Strip.

John Locher, The Associated Press Police run to cover at the scene of a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip, Sunday, Oct. 1, 2017, in Las Vegas. Multiple victims were being transported to hospitals after a shooting late Sunday at a music festival on the Las Vegas Strip.



David Becker, Getty Images People run from the Route 91 Harvest country music festival after apparent gun fire was heard on Oct. 1, 2017 in Las Vegas, Nevada. There are reports of an active shooter around the Mandalay Bay Resort and Casino.

David Becker, Getty Images People run from the Route 91 Harvest country music festival after apparent gun fire was heard on Oct. 1, 2017 in Las Vegas, Nevada. There are reports of an active shooter around the Mandalay Bay Resort and Casino.

John Locher, The Associated Press A police officer takes cover behind a truck at the scene of a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip, Sunday, Oct. 1, 2017, in Las Vegas. Multiple victims were being transported to hospitals after a shooting late Sunday at a music festival on the Las Vegas Strip.



John Locher, The Associated Press A police officer takes cover behind a police vehicle during a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip, Sunday, Oct. 1, 2017, in Las Vegas.

John Locher, The Associated Press Police stand at the scene of a shooting along the Las Vegas Strip, Monday, Oct. 2, 2017, in Las Vegas. Multiple victims were being transported to hospitals after a shooting late Sunday at a music festival on the Las Vegas Strip.

Chase Stevens, Las Vegas Review-Journal via AP A wounded person is walked in on a wheelbarrow as Las Vegas police respond during an active shooter situation on the Las Vegas Stirp 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.



John Locher, The Associated Press Police officers and medical personnel stand at the scene of a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip, Monday, Oct. 2, 2017, in Las Vegas. Multiple victims were being transported to hospitals after a shooting late Sunday at a music festival on the Las Vegas Strip.

John Locher, The Associated Press 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. Multiple victims were being transported to hospitals after a shooting late Sunday at a music festival on the Las Vegas Strip.

Chase Stevens, Las Vegas Review-Journal via AP A man waits during lockdown at the Tropicana Las Vegas during an active shooter situation on the Las Vegas Strip 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.



Chase Stevens, Las Vegas Review-Journal via AP People assist a wounded woman at the Tropicana during an active shooter situation on the Las Vegas Stirp 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.

Chase Stevens, Las Vegas Review-Journal via AP Las Vegas police sweep through a convention center area during a lockdown Monday, Oct. 2, 2017, at the Tropicana Las Vegas following an active shooter situation on the Las Vegas Strip. Multiple victims were transported to hospitals after a deadly shooting late Sunday at a music festival on the Las Vegas Strip.

Chase Stevens, Las Vegas Review-Journal via AP People are searched by Las Vegas police at the Tropicana Las Vegas during an active shooter situation on the Las Vegas Strip on 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.



Steve Marcus, Las Vegas Sun via AP A body is covered with a sheet after a mass shooting in which dozens were killed at a music festival on the Las Vegas Strip on Sunday, Oct. 1, 2017.

Ethan Miller, Getty Images People hug and cry outside the Thomas and Mack Center after a mass shooting at the Route 91 Harvest country music festival on Oct. 2, 2017 in Las Vegas, Nevada. A gunman, identified as Stephen Paddock, 64, of Mesquite, Nevada, opened fire from the Mandalay Bay Resort and Casino on the music festival, leaving at least 50 people dead and hundreds injured. Police have confirmed that one suspect has been shot. The investigation is ongoing.

Chip Somodevilla, Getty Images The U.S. flag flies at half-staff over the White House Oct. 2, 2017 in Washington, DC. President Donald Trump ordered the flags on all federal buildings to fly at half-staff following the mass shooting that left more than 50 dead in Las Vegas. The gunman, identified as Stephen Paddock, 64, of Mesquite, Nevada, opened fire from the Mandalay Bay Resort and Casino on an outdoor music festival. Police have confirmed that one suspect has been shot. The investigation is ongoing.



Alex Wong, Getty Images U.S. President Donald Trump makes a statement on the Las Vegas mass shooting at the Diplomatic Room of the White House October 2, 2017 in Washington, DC. The gunman, identified as Stephen Paddock, 64, of Mesquite, Nevada, opened fire from the Mandalay Bay Resort and Casino on the music festival, leaving at least 50 people dead and hundreds injured. Police have confirmed that one suspect is dead. The investigation is ongoing.

Evan Vucci, The Associated Press President Donald Trump makes a statement about the mass shooting in Las Vegas, Monday, Oct. 2, 2017 at the White House in Washington.

John Locher, The Associated Press MGM Resorts announced Friday that it does not plan to rent out room No. 32135 at Mandalay Bay Resort and Casino, the perch from which Stephen Paddock shot and killed 58 people and injured more than 500.



Ronda Churchill, The Associated Press People walk near the Las Vegas Strip shortly after sunrise Monday, Oct. 2, 2017, in Las Vegas. A deadly shooting occurred Sunday at a music festival on the Las Vegas Strip.

Ronda Churchill, The Associated Press A woman speaks on the phone while walking along the Las Vegas Strip near Mandalay Bay hotel and casino Monday, Oct. 2, 2017, in Las Vegas. A mass shooting occurred late night Sunday at a music festival on the Las Vegas Strip. (AP Photo/Ronda Churchill)

Ronda Churchill, The Associated Press Melissah Burke and her husband Stephen, of Seattle, walk along the Las Vegas Strip near Mandalay Bay hotel and casino Monday, Oct. 2, 2017, in Las Vegas. The couple, who were attending the music festival last night where a mass shooting occurred, found refuge in a nearby apartment and casino.



Ethan Miller, Getty Images Concert-goers wait for a ride outside the Thomas & Mack Center after a mass shooting at a country music festival on Oct. 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. The gunman, identified as Stephen Paddock, 64, of Mesquite, Nevada, opened fire from the Mandalay Bay Resort and Casino on the music festival, leaving at least 50 people dead and hundreds injured. Police have confirmed that one suspect has been shot. The investigation is ongoing.

Mark Ralston, AFP/Getty Images Crime scene tape surrounds the Mandalay Hotel 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 Oct. 2, 2017. Police said the gunman, a 64-year-old local resident named as Stephen Paddock, had been killed after a SWAT team responded to reports of multiple gunfire from the 32nd floor of the Mandalay Bay, a hotel-casino next to the concert venue.

Clark County Sheriff Joseph Lombardo says Paddock first checked into the Mandalay Bay casino-hotel on Sept. 28.

Heavily armed police searched the Nevada home of Paddock in the Sun City Mesquite retirement community, about 80 miles north of Las Vegas. Mesquite Police Chief Troy Tanner says police surrounded and entered the single-family home where 64-year-old Stephen Paddock lived with 62-year-old Marilou Danley early Monday morning.

Authorities say that 406 people were taken to hospitals and 50 of those are dead, including an off-duty Las Vegas police officer. His name was not immediately released.