Investigators told FOX 5 Atlanta the shooting happened 9:37 p.m. Sunday inside in "hell" portion of The Masquerade on Lower Alabama Street. The gunman also fired toward the ground, and "most likely" hit the other victims at that time.
The men who had climbed on the stage collapsed on the stairs heading outside.
The show's headliner was Cousin Stizz and the shooting occurred just before he was to take the stage.
After firing off a few shots, the gunman ran along with victims and other patrons out of the club. He then pulled out a gun and shot both of them. Police have asked that anyone who witnessed the shooting or may have information about the events that unfolded at Underground Atlanta to contact them.
Two people died and two others were hurt, but are stable, according to police. Police quickly responded to calls about a shooting at the venue.
He tweeted a statement about the shooting, sending his condolences.
The rapper is "completely heartbroken" by the incident. ".I'm in shock and at a loss for words for the senseless violence". "My thoughts and prayers go out to the victims and their families".
Police are asking eyewitnesses to call the Atlanta Police Department or Crime Stoppers at 404-577-TIPS.