SAO PAULO– Several major Brazilian cities including the two largest, Sao Paulo and Rio de Janeiro, were plunged into darkness Tuesday, witnesses said, in a blackout initially attributed to problems at a hydroelectric dam.

The power outage hit at 10:15 p.m. (0015 GMT Wednesday) and spread to the states of Sao Paulo and Rio de Janeiro, including both their capitals, the states of Minas Gerais and Espirito Santo, in the southeast, Mato Grosso do Sul, in the southwest, parts of the central state of Goias, as well as the federal district of Brasilia.

The blackout reportedly affected large swaths of Brazil’s major cities in those states as well.

Globo television said National Electric System officials blamed the blackout on a domino effect in the country’s power grid from a power failure at the Itaipu hydroelectric plant that Brazil shares with Paraguay.

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Brazil’s 2 largest cities hit by blackouts

RIO DE JANEIRO — Brazil’s two largest cities have been hit by a massive blackout that has also affected other parts of Latin America’s largest nation.

Media reports say problems at a huge hydroelectric dam are to blame for the electrial outages affecting large parts of Rio de Janeiro, Sao Paulo and other cities in several states.

The G1 Web site of Globo TV says Brazil lost 17,000 megawatts of power after an unspecified problem happened at the Itaipu dam that straddles the border of Brazil and Paraguay.

Officials did not immediately comment on Tuesday’s outages. The blackouts came three days after CBS’s “60 Minutes” news program reported several past Brazilian power outages were caused by hackers. Brazilian officials played down the report.

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