At least 50 people have been killed and more than 200 injured after at least one gunman opened fired 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. 

According to the Las Vegas police, the shooter fired into the crowd from the 32nd floor of the Mandalay Bay hotel. 

The suspected attacker was later killed in a shoot-out with police, officials said. 

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 tooke 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.

He added that security showed up “almost immediately”. 

Videos posted on social media show the crowd ducking for cover as multiple shots can be heard. 

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