About two dozen people were reported injured in the incident at the fairgrounds in Indianapolis. Strong winds caused the stage rigging for the outdoor concert to collapse, trapping and injuring concert-goers shortly before 9 p.m.
No one was performing at the time. The opening act had finished, and the crowd was waiting for Sugarland to take the stage.
But due to strong winds, thousands were being evacuated from the fairground grandstand to a nearby coliseum. The rigging fell onto an area where some fans were seated.
After the accident, Sugarland tweeted, "We are all right. We are praying for our fans and the people of Indianapolis. We hope you'll join us. They need your strength."
The Associated Press contributed to this report.