A launch party for rapper Rick Ross' new album Mastermind ended in gunfire early on Monday morning (03Mar14).

Reports suggest a Dj who was working at the Velvet Room nightclub in Atlanta, Georgia opened fire on two off-duty police officers after they went outside to investigate the sound of gunshots.

The Dj was hit in the leg when the cops, who were working at the nightclub, returned fire. He was subsequently arrested and taken to Grady Memorial Hospital where he was treated for non-life threatening injuries.

The local area's Public Safety Director Cedric Alexander tells the Atlanta Journal-Constitution, "For whatever unknown reasons, it appears that this Dj who was involved in the shooting with some others turned and shot at the officers, and that's when they returned fire... They (the cops) were doing what they were trained to do. They took all the necessary actions to protect themselves and each other."

No one at Ross' album launch party, which is also believed to have involved Sean 'Diddy' Combs, is thought to have been caught up in the shooting.