( CNN ) -- An album release party at a Chicago nightclub ended in gunfire , sending seven people to the hospital early Thursday morning , police said . All seven were listed in stable condition , Chicago police spokesman Hector Alfaro said . He said the shooting took place at an album release party for a rapper . The night 's rap concert at Mr. G 's Entertainment Center featured Lil ' Mouse and King Samson , the Chicago Tribune reported , citing police and a patron of the club . A fight broke out , and three men pulled out weapons and started firing , Alfaro said . A 19-year-old female was among the seven shot . The rest were men between ages 20 and 30 , he said . Police believe the shooting is gang related , but they do n't have anyone in custody .
NEW : Report : Lil ' Mouse and King Samson were performing at the club . All three people involved are in stable condition . The shooting took place during an album release party . Police believe it is gang - related .