Major power failures hit Brazil: Authorities don't know what caused it: "A power blackout in Brazil left tens of millions of people sitting by candlelight, after plunging its two largest cities into darkness.
Underground railways, traffic lights, street lamps, lifts and electric gates in Sao Paulo and Rio de Janeiro were all affected.
It was several hours before the problem could be fixed.
The authorities believe it could have been caused by a fault at the giant Itaipu hydro-electric dam."
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