"Hey folks! Severe weather, high winds and rain just passed thru here in Thackerville, OK. Emergency crews are on the scene as tent collapsed and some folks who were seeking shelter were injured. Waiting to determine damage to our stage and production," he posted on Twitter.
Carter also tweeted: "Waiting and praying for our fans that were injured. If we can perform we're ready to go. But safety is first."
KOCO-TV, an Oklahoma City ABC affiliate station, reports the incident occurred around 5:30 p.m. local time. The news outlet says people were evacuated due to an oncoming storm and people were injured when "something happened inside" the pavilion, according to WinStar's Kym Koch.
WinStar released the following statement to ET: "All patrons in the area were asked to move and to seek shelter from the storm. However, about 150 patrons who were standing in line for the Backstreet Boys concert did not heed staff's warning ... the storm hit and knocked over the concert entrance trusses with 70-80 mile an hour winds and heavy rain. 14 people were treated at the scene and then transported to local hospitals. Two have already been released."
Dallas reporter Allison Harris of Dallas tweeted photos from an attendee on the scene and wrote, "Friend at the Backstreet Boys concert at Winstar Casino says an awning fell on people. She estimates 10 ambulances responded, paramedics took people out on stretchers."
She later shared a video tweeted to her from someone at the concert from "right after it fell. Several people hurt including a young girl. Several fans spring to action including former army nurse who’s husband was hurt."
Although WinStar initially said on social media that "the show will go on rain or shine," Richardson posted news of the concert's cancelation later in the evening. "Update... 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!" he said.