The report is thanks to Inexplicata: The Journal of Hispanic Ufology via Unexplained Mysteries and they write that the occurrence was over the San Lorenzo Stadium "during the last game against Botafogo for the Libertadores de America Cup, ending in a 3-0 victory by San Lorenzo." Good to at least know who won. The crowd was simply cheering for the game but the chanting was a bit reminiscent of Close Encounters of the Third Kind so you never know!
The anomaly moves left to right in an odd and rapid fashion and the video slows it down and enhances the image so you can take a better look and judge for yourselves. Is it a UFO? Well yes because it's not identified as anything specifically from our world, yet, but we'd love your opinion on what it might be. A hoax? A new type of experimental aircraft? A soccer superfan from Mars? Mothra? Let us know if we should start making tinfoil hats or if it's simply something of this world.