Officer Carlos Manfredi says several people were detained for questioning after the shooting occurred around 6 p.m. Saturday.
Manfredi said a 64-year-old man who was caught in the crossfire got shot in the arm. He's hospitalized in stable condition.
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Four shots were heard in a witness video posted online. The shooting triggered a chaotic scene as dozens of people ran screaming as officers carrying handguns rush to the scene.
Manfredi said the argument had nothing to do with the gay pride event.
A concert that was part of the weekend-long gay pride celebration across the city was ending around the time of the shooting.