The journalists provided no evidence of the purported US program at the news conference held yesterday, nor details of who it targeted.
Jeremy Scahill, a contributor to The Nation magazine and the New York Times best-selling author of "Dirty Wars," said he will be working with Glenn Greenwald, the Rio-based journalist who has written stories about US surveillance programs based on documents leaked by former NSA contractor Edward Snowden.
"There are so many stories that are yet to be published that we hope will produce 'actionable intelligence,' or information that ordinary citizens across the world can use to try to fight for change, to try to confront those in power," said Scahill.
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Neither Scahill nor Greenwald, who also appeared at the film festival's question and answer panel, provided many details about their joint project.
Greenwald has been making waves since the first in a series of stories on the NSA spying program appeared in Britain's Guardian newspaper in June. Last week, Brazilian President Dilma Rousseff postponed a scheduled state dinner with Obama after television reports to which Greenwald had contributed revealed that American spy programs had aggressively targeted the Brazilian government and private citizens.