Huracan fans killed fighting among themselves
"They clashed at the hospital entrance and when we heard gunfire we called the police," the manager of local Penna hospital, Jorge Bilecio told reporters.
Chief duty doctor Angela Toscano said: "A first group of wounded people, all between 28 and 30 years old, arrived (at the hospital) on Sunday around 9.30pm, one with a bullet wound close to his heart who died.
"Another patient with a chest wound was operated on but died at 7.40am today (Monday)," she added.
She said another man "with a knife wound was in critical condition".
Toscano said some of the wounded fled from the hospital after treatment and without being discharged, one man with a head wound and another with a leg fracture.
Huracan's young team have been a breath of fresh air in the first division this season with a stylish attacking game that has left them on the brink of the club's second title when they meet Velez Sarsfield in the decider next weekend.
The unofficial organisation "Let's save football" which campaigns against violence in the game has a list on its website of 236 people who have lost their lives in football-related violence in Argentina since 1924.