Speculation swirls around deaths and disappearances of staff at secretive government laboratories. Here's what we know.

TL;DR

President Trump has expressed concern over the deaths and disappearances of 10 government workers, hinting at a potential sinister plot.
Investigators and officials involved in the cases state there is no evidence linking these events and do not see a pattern of foul play.
Online speculation has linked the incidents to threats against U.S. nuclear or space programs, foreign espionage, or UFO theories.
Several of the individuals were associated with sensitive facilities like NASA's Jet Propulsion Laboratory and Los Alamos National Laboratory.
Those familiar with the cases suggest deaths and disappearances are more likely due to personal tragedies, suicide, accidents, or unrelated criminal acts.
William Neil McCasland, a retired Air Force major general, disappeared in February, sparking speculation due to his past work and consultation for a UFO research group.
Other cases include the disappearance of an aerospace engineer hiking in California, the murder of an MIT professor by a former classmate, and the deaths of other scientists and staff members.
The FBI is aware of the situation and providing assistance but is not the lead agency unless requested by local authorities.
The Department of Energy's National Nuclear Security Administration is reviewing the matter due to fears of a link, though former officials acknowledge that while employees are targets for espionage, no evidence of a link has been seen in these specific cases.

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