Terrible, apparently there were at least 4 people killed and some 24+(?) injured. The stage collapsed between the opening and main act due to a wind gust from a storm that passed through the area around 9PM EST (5PM GMT). Crews are working to reach the injured who apparently are still trapped in the wreckage. Notice the crowd at the foot of the stage in the video below, no time to escape the falling structure.
The Collapse
The Aftermath
Prayers….
H/T to @emergencystream on Twitter