Police in Rio de Janeiro used tear gas to disperse around 100 protesting teachers who tried to disrupt the city council vote on a wage increase.
Demonstrators had blocked streets and forced the closure of several metro stops during the city's evening rush hour.
Anarchist group Black Bloc also joined the protest, shattering glass at banks, bus stops and traffic lights, and burning garbage to block streets yesterday.
In addition to tear gas, police used stun guns and pepper spray. They arrested 17 people, saying in a statement none of the detainees were teachers.
The city's public primary and preschool school teachers have been on strike for 46 day and reject the city's plan, which the union says will only benefit seven percent of the teachers.
The planned wage increase would only apply to teachers who work 40 hours a week, "which is a small minority," a physical education teacher, Daniel Raposo, 28, said. He said most teachers were earning just 28 reais (USD 11) an hour.
The teachers are demanding negotiations be resumed on the proposal.
