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Transgender prostitutes were filmed apparently attacking a customer for not paying and then brawling with him in the middle of a student protest.
Demonstrators watched in horror as sex workers started beating up the man as a large rally took place in front of a college near Buenos Aires in Argentina.
According to reports, they attacked the man in broad daylight, using a stick to beat him, because he owed them for "services rendered".
Police were on hand to make sure the protest did not turn violent but they were not expecting what happened next.