Though rarely activated except for periodic testing, those sirens were intended to warn of danger when they were erected back in 2008, in the wake of the massacre at Virginia Tech that took place in 2007.
The alerts Tuesday went out just before 6:50 p.m. and warned that a possible threat was on campus. Students were encouraged to stay inside and lock doors. Everything was deemed safe by around 7:15 that night.
Read more at the Johnson City Press.