At least 14 people have been injured and transported to hospitals after trusses holding up the entrance to a resort where the Backstreet Boys were set to begin a concert in Oklahoma collapsed.
An evacuation began at about 5pm when lightning was within four miles of the casino, WinStar World Casino and Resort said in a statement posted on Twitter.
The luxury casino resort said around 150 people in attendance did not evacuate and when the storm hit with 70-80 mph winds – which caused the entrance trusses to collapsed on them.