I call BS.
http://www.youtube.com/watch?v=jqMDdx_X2_c
The title translates into "giant snake killing two girls in Rio Sapucaí - (weighted images) "
The text in the video: "Attack of snake kills two girls."
I found this on another site. Loose translation:
A group of young Sapucaí bathed in the river in the town of Itajubá - MG, when an anaconda snake appeared and killed two girls, 16 and 17 years on Sunday (15). One of the victims have yet been found by villagers a few meters after the incident, but died in hospital with a cardiac arrest.
I have my doubts on this. I don't believe one snake could kill 2 people at once especially with all those people around.
So I say this is fake.