Though they refused to offer many details on the project, journalists Jeremy Scahill and Glenn Greenwald on Saturday night announced that they are now working together on a joint investigation on how the U.S. National Security Agency has been involved in the wider overseas “assassination program” run by the Obama administration.

As the Associated Press reports from Rio de Janeiro—where Greenwald and Scahill attended the South American premiere of , a documentary film based on Scahill’s book of the same name—the U.S. journalists “known for their investigations of the United States’ government” have now “teamed up to report” on how the vast surveillance network of the NSA operates in conjunction with clandestine operations run by the U.S. military or CIA.

“The connections between war and surveillance are clear. I don’t want to give too much away but Glenn and I are working on a project right now that has at its center how the National Security Agency plays a significant, central role in the U.S. assassination program,” said Scahill, according to AP, while speaking at a roundtable discussion at the Rio Film Festival.

“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,” Scahill added.

Greenwald, who has been entrusted with a trove of top-secret NSA documents by whistleblower Edward Snowden and reported extensively on their contents, has previously indicated that there is much more to come from the information contained in the files.