"At 5:00 p.m., WinStar World Casino and Resort officials began evacuation of the outdoor concert venue after observing that lightning was within four miles of the casino".
Of the 14 people taken to a hospital, two have been released.
The Backstreet Boys were forced to call off a show in Oklahoma on Saturday after a sudden storm blew through the area and injured 14 fans waiting in line outside the venue. Keep your tickets because, Backstreet WILL BE BACK!'
Additionally, a temporary structure was knocked down, injuring a number of fans prior to the show.
The injured were treated at the scene by Love County, Oklahoma, paramedics and others who responded along with police and highway patrol officers.
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Howie D., left, Kevin Richardson, Nick Carter, AJ McLean and Brian Littrell of the Backstreet Boys perform on ABC's "Good Morning America" in Central Park, Friday, in NY.
Fans waiting to see a Backstreet Boys concert in Oklahoma have been injured after a pavilion collapsed. Instead the weather did it's own pre show performance and showed us all up.
However, at 6 p.m. local time, about a half hour after the storm hit, the band tweeted from its official account that the concert would be cancelled and they would "attempt to reschedule". "But safety is first", Carter tweeted, along with a photo of storm clouds over the venue.
Video from a witness at the scene showed multiple emergency vehicles, including ambulances, in the parking lot of the casino.
Fourteen people were injured in the incident that was caused by storms moving through the area.