By George Powell, Contributing Reporter

RIO DE JANEIRO, BRAZIL - For the second time this month, Rio's city center was rocked by percussion grenades and tear gas as thousands of people took to the streets on Monday in support of striking schoolteachers.

Somewhere between ten and 50,000 protesters left Candelária in Centro shortly after 5PM and made their way to Cinelândia, where they gathered in front of City Hall.

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