Fans were enjoying a Rascal Flatts concert in Indianapolis, but were left confused when the music stopped.
The group abruptly left the stage, and didn't return for their encore.
Staff quickly evacuated the amphitheater, and officials say it's an ongoing investigation.
The next video shows the moments right before the band left the stage.
Fans were disappointed, but also understanding, with one concert-goer saying she saw 'a man taken down in handcuffs.'
It was disappointing but we understand the need for safety. Not exactly sure what happened. I was in the pit. I just saw a man taken down in handcuffs. But I love you guys. I will still see you every time you come to St Louis and Indianapolis or anywhere close! You're the best 😘— Maranda Cronkhite (@lovedance0788) August 10, 2018
Something bad happened at Rascal Flatts tonight. Security guards had us scared. Told us things were not okay. 😔— Caitlyn conlon (@caitlyn_conlon) August 10, 2018
Glad everyone is ok. Thanks for putting everyone's safety first! You guys put on one heck of a show last night! Can't wait to see you guys again! Love you guys!— Alicia Tembo (@AliciaTembo2) August 10, 2018
Indianapolis - Due to a security concern at the show last night, standard procedures were quickly executed and everyone was able to safely leave the building.— Rascal Flatts (@rascalflatts) August 10, 2018
The safety of our fans, band and crew is always the top priority for us, so we are so thankful for everyone who jumped into action and for your understanding. We will be back soon!— Rascal Flatts (@rascalflatts) August 10, 2018