BBC News, with photos and with analysis by Wyre Davies, Rio correspondent, Oct. 8, 2013
[....] Teachers have been agitating for a pay increase for two months. About 50,000 people were estimated to have marched to support them before the violence broke out, but police would only confirm the 10,000 estimate [.....].,
[....] The latest demonstrations in Rio were among the most violent yet, even though it had started out with at least 10,000 overwhelmingly peaceful teachers and other trades unionists.
Who exactly the masked youths, known as the Black Blocs, are isn't clear. But the anarchy they sowed in the historic centre of Rio doesn't bode well and may lead to a radical change of approach - both from the authorities and those protestors who want to demonstrate peacefully [....]