The group of about 50 included teachers, parents and dancers between the ages of five and 15-years-old.
The group had travelled from Grand Bourg, a suburb of Buenos Aires, to dance in a competition in San Rafael, Mendoza.
Authorities were still investigating the cause of the accident.
According to reports, the bus seems to have lost control on a tight curve on Argentinaâ€™s Route 144.
Local media reported the bus, which was driven by a pair of father-son drivers, was not licensed to operate commercially after their operating license expired.
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