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A group of scientists is pushing to publish research about how they created a man-made flu virus that could potentially wipe out civilisation.
The deadly virus is a genetically tweaked version of the H5N1 bird flu strain, but is far more infectious and could pass easily between millions of people at a time.
The research has caused a storm of controversy and divided scientists, with some saying it should never have been carried out.
Both papers are now being reviewed by the U.S National Science Advisory Board for Biosecurity (NSABB).
NSABB does not have the power to prevent the publication but it could ask journals not to publish.
Paul Keim, chairman of NSABB, said: "I can't think of another pathogenic organism that is as scary as this one. I don't think anthrax is scary at all compared to this."