Linda Tesfatsion was waiting for the concert to start at the venue in Thackerville when the storm went through, she said.
“Hundreds of Backstreet Boys fans playing chicken with an Oklahoma storm right now. Giant metal entrance structure, portable toilets, blew over. A handful of people left in ambulances,” she wrote on Twitter with a picture of the structure that fell.
She said she saw four people put on gurneys and taken away by ambulances. A few of the injured had bandages on their heads but were able to walk, she said.
The metal structure that fell was holding up a purple banner that read “The Colosseum at WinStar,” she said.
Two of the people who were hospitalized have been released, Thompson said Saturday night.
In a tweet, the Backstreet Boys said they will attempt to reschedule the concert at a later date.
“We never want to put our fans in harm’s way and with tonight’s weather and the injuries from earlier, we have decided to cancel the show and will attempt to reschedule. The most important thing is for everyone to get home safely and we will see you all very soon!”
Richardson tweeted, “unfortunately, due to damage sustained in the storm earlier this evening, we are unable to perform the show tonight. Safety is always #1. Keep your tickets because, Backstreet WILL BE BACK!”
Members of the band 98 Degrees tweeted they were disappointed that Saturday’s show was canceled due to the weather.
“We know many of you traveled to be here today. Sending you all our love and hope to see you soon.”