[VanShuyten]

According to O Globo (the newspaper) Pres. Dilma has called an emergency meeting of the cabinet for Friday morning.
http://oglobo.globo.com/
There is tremendous violence in lots of cities, with “shock troops” being called out in at least one state capital, and police abandoning streets in other cities.

[Whenifhow]

There are videos on this page

Revolution? Brazilian protests swells to millions: government calls emergency meeting

http://theextinctionprotocol.wordpress.com/2013/06/21/revolution-brazilian-protests-swells-to-millions-government-calls-emergency-meeting/

Source is from the Guardian
http://www.guardian.co.uk/world/2013/jun/21/brazil-protests-president-emergency-meeting