Authorities said some 250,000 people attended the open air concert featuring the popular singer Indio Solari and his band in the town of Olavarria, a suburb of Buenos Aires.
The local health minister for the town, German Maroni, said 10 people had been admitted to an area hospital, including a woman being treated in the intensive care unit.
Witnesses said crowds thronged the concert stage at the event in Olavarria, a town of some 90,000 - roughly one-third as many people as the number of concertgoers - which led to the deaths and injuries.
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