The woman told police someone put drugs in her drink and then sexually assaulted her on the dance floor, WSB-TV reported. The victim, who was already streaming her celebration on Facebook Live, captured the attack as it happened and continued to stream the video.
According to media reports, the woman is heard in the video screaming for help.
Video of the sexual assault has since been removed from Facebook. The woman later posted a video saying she is OK, WSB-TV reported.
In a statement posted to Facebook and Twitter, Opera nightclub managers said they are cooperating with the investigation.
“At this time we have met with the Atlanta Police Department and have provided them with everything they have requested,” read the statement posted Sunday. “We will continue to aid and support their investigation in any way we can.”