Update at 10:30 a.m., Monday Oct. 2: The death toll in the shooting has risen to 58, according to national U.S. media.

Las Vegas, Nevada was the scene last night of the deadliest mass killing in modern U.S. history.

More than 50 concertgoers were killed and hundreds were injured late Sunday at a music festival on the Las Vegas Strip.

The gunfire began around 10 p.m. on the south end of Las Vegas Boulevard during the Route 91 country music festival. Authorities said the shooter was firing from one of the upper floors of the Mandalay Bay Hotel and Casino.

Automatic gunfire was captured on cellphone recordings of the concert, followed by panicked show-goers running for cover. Witnesses said the shooting lasted for 5 to 10 minutes. The crowd at the open air concert was estimated at 22,000 people.

Las Vegas police said at least 50 people were killed and more than 400 injured. The attack is the deadliest mass shooting in U.S. history, surpassing the 49 killed by a gunman last year at the Pulse nightclub in Orlando, Florida.

“My warmest condolences and sympathies to the victims and families of the terrible Las Vegas shooting. God bless you!” President Donald Trumptweeted Monday.

Police identified the suspected shooter as Stephen Paddock, 64, a Las Vegas resident. He died from a self-inflicted gunshot wound, police confirmed Monday.

“Right now we believe it’s a sole actor, a lone-wolf type actor,” Clark County Sheriff Joseph Lombardo said at a news briefing.

Lombardo said the shooter fired from the 32nd floor of the Mandalay Bay onto the 15-acre lot where about 30,000 had gathered to watch the final night of the festival.

Lombardo said reports of multiple shooters and explosives were false and that police have located a woman, Marilou Danley, who was believed to have traveled with the suspect. Police later said she was not involved in the shooting.

“It was was a horror show,” concertgoer Ivetta Saldana told the Review-Journal. “People were standing around, then they hit the floor.”

She said was attending the concert with a friend and hid in a sewer.

“We met someone at the gas station, a nurse, she was at the concert and she treated someone who was shot in the face, someone who was shot in the chest and someone who was shot in the liver,” a man identified as Todd told CNN.

Country singer Jason Aldean was rushed off the stage as shots were fired.

“Tonight has been beyond horrific,” Aldean wrote on Instagram. “I still don’t know what to say but wanted to let everyone know that me and my crew are safe … It hurts my heart that this would happen to anyone who was just coming out to enjoy what should have been a fun night.”

Victims were sent to University Medical Center and Sunrise Hospital Medical Center.

Las Vegas police were seeking footage or photographs of the events at the Mandalay Bay Resort and Casino.

The Bakersfield Police Department in California said several off-duty officers attended the concert and witnessed the shooting. One was injured, according to KGET-TV. A number of off-duty police officers were at the show.

Roads around the area, including Interstate 15, were closed. At midnight, more than 25 flights were diverted from nearby McCarran International Airport, according to airport spokeswoman Christine Crews.

Nevada Gov. Brian Sandoval called it a “tragic and heinous act,” adding that prayers “are with the victims and all affected by this act of cowardice.

Las Vegas Mayor Carolyn Goodman posted on Twitter: “Pray for Las Vegas. Thank you to all our first responders out there now.”

The number of wounded in the shooting at a concert in Las Vegas today amounted to more than 400, adding to at least 50 deaths, according to the latest police report, the sole suspect of the attack committed suicide.

The alleged attacker, Stephen Paddock, a 64-year-old white man, shot himself after committing the massacre, although earlier reports indicated he had been shot down by law enforcement.