I leave you tonight with this little mystery

If I hadn’t seen this on Fox this afternoon, I wouldn’t have even known about it. Fox has nothing on their website about it at all.
Apparently an Aeroflot 767 landed today at JFK at around 2PM EDT, and was met by FBI, Customs, and Port Authority police who boarded the plane looking for radioactive material.
Google News found articles here, here, and here. Nothing in US media at all, apparently. Wait, here’s one from WABC in New York. Searches at Fox, CNN, and PMSNBC came up negative.
Who’s trying to cover this up?