The outdoor show of the legendary group was due to take place at the Colosseum at WinStar World Casino and Resort in Thackerville, 190km from Oklahoma City on Saturday evening.
The resort had started evacuating the concert venue about 5 p.m. after lightning was spotted within 4 miles. While Thompson said patrons were asked to move and keep shelter from the storm, about 150 patrons waiting in line did not heed to their warning.
Injured concert goers were treated at the scene, and then taken to local hospitals, according to the casino.
One woman at the concert reported at least one person unconscious, one with a bloody head wound and at least seven transported in ambulances to hospitals. Two individuals have since been released, the company said, adding that officers from the Lighthorse Police and the Oklahoma Highway Patrol, as well as Love County emergency responders, responded to the scene. Giant metal entrance structure, portable toilets, blew over.
The concert by Backstreet Boy and 98 Degrees was canceled. The most important thing is for everyone to get home safely and we will see you all very soon!'
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Backstreet Boys member Kevin Richardson told fans via his Twitter account that safety inspectors had checked the stage for damage after the storm.
Howie shared: 'So sad as I was really excited for us to rock Oklahoma tonight.
Nick Carter tweeted about the incident, sending well wishes to the hurt fans. If we can perform were ready to go. We know many of you traveled to be here today. "Hope everyone's ok and safe", he wrote.
The Saturday night show was to be the Backstreet Boys' final show before they begin a residency at Planet Hollywood in Las Vegas in October.