A congressional probe launched this week into the string of missing scientists was sparked by the disappearance of a former high-ranking official who oversaw some of the military’s most classified res...

The FBI is investigating a series of deaths and disappearances of scientists and staff who worked at sensitive nuclear or space technology laboratories, including four from the Los Angeles area.

“Once you see the facts, it would suggest that something sinister could be happening and it would be a national security concern,” Comer said, adding he and Burlison were looking to “see if we can put...