Campaigning before Brazil runoff vote marred by violence

As the runoff presidential election approachs, Brazil has seen a number of attacks against Workers’ Party supporters, journalists and activists.

Most of the violence has been blamed on supporters of far-right candidate Jair Bolsonaro, who is leading the polls.

However, Bolsonaro himself was also the victim of a stabbing attack last month.

Al Jazeera’s Daniel Schweimler reports from Sao Paulo.