Fourteen people were injured when a storm hit in Thackerville, Oklahoma, where fans were awaiting a Backstreet Boys concert on Saturday, Aug. 18, 2018.
The staff had begun evacuating fans in the venue after lightning was spotted, Kym Koch Thompson, a spokeswoman for WinStar World Casino and Resort, said.
At about 5:30 p.m. local time, the storm's 70 to 80 miles per hour winds and heavy rain knocked down the concert trusses.
Officials say 14 people were treated at the scene and then transported to local hospitals.More news: Bushfire threatening homes on NSW south coast to 'burn for days'
The scheduled outdoor show at WinStar World Casino and Resort in Thackerville, between Oklahoma City and Dallas along Interstate 35, was ultimately postponed.
Band member Kevin Richardson tweeted earlier that the concert had sold out, with about 12,000 fans expected to hear the group.
ET's Steve Wilks confirmed 14 people were injured after allegedly failing to heed venue staff's warning to move away from the pavilion. They said they would "attempt to reschedule". Two people, so far, have been released.
Thompson said Love County emergency responders, Lighthorse Police and Oklahoma Highway Patrol are already on the scene.More news: Priyanka Chopra, Nick Jonas' dance at engagement bash
The Backstreet Boys have sent their thoughts to the fans injured today. Keep your tickets because, Backstreet WILL BE BACK!'
Richardson tweeted, "unfortunately, due to damage sustained in the storm earlier this evening, we are unable to perform the show tonight".
"Waiting and praying for our fans that were injured. But safety is first", he said.
"We are disappointed that tonight's show was canceled due to the inclement weather", said 98 Degrees via the band's Twitter page. Here's what we know. The most important thing is for everyone to get home safely and we will see you all very soon!'More news: Chelsea v Arsenal Preview, Team news, Line-Up and Score Prediction