There was an international played match here in Brazil at the weekend and the protests descended into violence when police stopped them reaching the stadium.
Today a military police leaflet says: "Protest in peace...Democracy, yes. Vandalism, no."
Protesters gathering in Belo Horizonte will march to the stadium where Brazil take on Uruguay in the Confederations Cup later.
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A minimum number of black players will have to be selected in all national teams, with the target calculated on an annual basis.
Western areas will see the rain first but by the end of the day it will also have spread eastwards.