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Brazil presidential candidate Campos in plane crash - source
The plane, a Cessna 560XL, lost contact with air traffic control as it was preparing to land, according to an Air Force statement. Television images showed smoke billowing from the crash site in a residential area of Santos.
A police official in Santos said there were "certainly" fatalities in the crash, but could not say how many or provide any additional information.
The party source, who spoke on condition of anonymity, said Campos' running mate, Marina Silva, was not on board the plane.
(Reporting by Brazil newsroom)