From Gizmodo:
Ever since the National Solar Observatory in Sunspot, New Mexico, was evacuated and visited by the FBI on September 6, the organization that runs the facility has been mum on the “security threat” that led to the closure.
The relative silence on the part of Association of Universities for Research in Astronomy (AURA) has led to wild speculation and theories about what the organization could be hiding—including proof of alien life, military testing, and evidence than an asteroid is heading toward Earth.