The Brazilian government is refuting a report aired on Sunday by the CBS news magazine 60 Minutes, which stated that power blackouts in the South American nation in 2005 and 2007 were caused by hackers. Meanwhile, a large swath of Central Brazil is still reeling from another massive blackout that occurred in the region Tuesday evening. Citing six unnamed sources in the intelligence, military and cybersecurity communities, 60 Minutes claimed that a two-day outage that affected 3 million people in the Brazilian state of Espirito Santo was caused by hackers hitting a utility company’s control systems. Another, smaller outage in January 2005 also was caused by hackers, the report said. According to the Wired.com Threat Level blog, the utility company involved, Furnas Centrais Elétricas, said it “has no knowledge of hackers acting in Furnas’ power transmission system.” “Brazilian government officials disputed the report over the weekend, and Raphael Mandarino Jr.