Brazil’s far-right president, Jair Bolsonaro, is expected to speak in the coming hours – breaking the silence he has maintained since being defeated in Sunday’s presidential election.
Tension has risen in the country after Mr Bolsonaro broke with the tradition of acknowledging defeat.
Some of his supporters are refusing to recognise the results, and have erected roadblocks across the country.
Police said they had cleared more than 300 roadblocks so far, but 267 remain.
Dozens of flights in and out of São Paulo’s international airport had to be cancelled after a key access road was cut off by protesters.