Atlanta Police said that four people were shot on Sunday, Nov. 12, at the Masquerade at Underground Atlanta, resulting in two deaths.

The shooting occurred at a Cousin Stizz show. In an Instagram post, he said he was “Completely heartbroken” by the incident and said the shooting occurred before he took the stage.

“I’m in shock and at a loss for words for the senseless violence,” he wrote.

Police responded to the incident at approximately 9:37 p.m. The shooting occurred in the cub’s “Hell” music venue in the Kenny’s Alley section of the venue.

“Zone 5 units had responded to a Person Shot call at the concert venue with multiple shooting victims and one suspected shooter that had fled the scene,” Atlanta Police said. “One victim was deceased on scene with a defect consistent with a gun shot wound to the chest. Grady EMS had responded to the scene and transported three additional shooting victims to Grady Memorial Hospital. A second shooting victim was pronounced deceased at the hospital with [wounds] to the upper and lower back of the torso.”

The other two victims were wounded in the ankle and foot, the Police Department said.

“The preliminary investigation indicates that the two deceased victims earlier had become rowdy and climbed up onto the stage during the break before the main act appeared,” the Police Department said. “Another patron took issue and an argument ensued. This other patron then drew a pistol and shot the two victims as well as toward the ground, most likely striking the additional victims at this time. All patrons including the victims and suspect fled toward the front exit. The decedents had collapsed near the stairs going up to the exit door. The suspect shooter, still armed, was witnessed by unarmed security but was not successfully detained. The investigation is ongoing.”

The Masquerade recently announced plans to remain at Underground Atlanta for the foreseeable future. Atlanta Loop left a message with the Masquerade seeking comment and will update this story when a response is received.