At least 59 people have been killed and more than 527 injured after at least one gunman opened fire on concert-goers on the popular Las Vegas Strip in the US state of Nevada.
The mass shooting took place late on Sunday outside a building at the Mandalay Bay Resort and Casino during the Route 91 country festival. More than 22,000 people were in attendance at the concert.
Police named the shooter as 64-year-old Stephen Paddock, who they said fired into the crowd from the 32nd floor of the Mandalay Bay hotel.
He was later found dead in his hotel room, a police statement said.
Eric Paddock, Stephen’s brother, said on CNN that his brother had “absolutely” no mental problems or political motives that the family was aware of.
Cole Watson, who was at the concert with his wife and kids, said: “At first it sounded like someone was setting off a whole lot of fire crackers”.
He said when they “realised it was gunfire and everybody started running”.
“The scene was insane – it was absolute chaos,” Watson told Al Jazeera by telephone.
Wade Millward, a journalist with the Las Vegas Review-Journal, told Al Jazeera that the attack took place while country-music star Jason Aldean was performing.
“Witnesses told me they heard a sound like fireworks going off,” he said.
“Aldean played on for about thirty seconds before it dawned on everyone that this was not fireworks. Then people hit the ground and people ran.”
Watson said he saw several injured people when he and his family ran from the scene of the attack.
Aldean later wrote on social media that he and his band and crew were safe. He called the night “beyond horrific” and offered condolences.
Another witness, Felipe Uribe, was watching the concert from the top floor of the Mandalay Bay hotel when he saw the attack take place.
“We were looking at the concert down below when we saw what appeared to be fireworks,” Uribe told Al Jazeera. “It wasn’t until later on that we realised it was actual gunshots.”
He said that people were running all over the place and “they were laying on the floor on their backs or their stomachs”.
“We didn’t know at that time the shots were coming from the hotel.”
Police later took Uribe and others he was with to a secure location where they had to wait for the situation to be cleared.
Videos posted on social media show the crowd ducking for cover as multiple shots can be heard.