"As Governor of the state you serve, I am calling on you to directly and verbally address the people of Kentucky and provide proof of your capacity to serve, or resign," Beshear said.
The Frankfort Police Department said it responded to an incident on the school's campus Tuesday afternoon "regarding an active aggressor."
UPS Airlines says a fleet of planes grounded after a deadly crash is expected to miss the peak holiday season due to inspections and possible repairs.
UPS and FedEx said they are grounding their MD-11 planes "out of an abundance of caution" following a deadly crash in Kentucky. The FAA has also issued a directive prohibiting all MD-11 operators from flying the aircraft.
The death toll has risen to 13 after a UPS plane departing Louisville Muhammad Ali International Airport in Kentucky crashed in a ball of flames earlier this week.
A UPS cargo plane crashed and exploded in a massive fireball while taking off from the company's global aviation hub, killing at least nine people and injuring 11.