An ammonia leak forces everyone inside the Nestle Plant in Mount Sterling to evacuate.
It happened around 8 p.m. Sunday.
Firefighters say most employees have been sent home and those that were scheduled to come in were turned around.
Just before 8 p.m., emergency crews rushed to the scene; fearing a repeat of an explosion at the same plant just last month.
This time it was an ammonia leak on the roof.
Montgomery County Fire Major Tony Clayton says a visible plum could be seen over the building.
He says 20 or so employees were evacuated, and the plant's haz-mat crew took care of the situation with no one breathing in the ammonia.
The plant still hasn't recovered from last month's explosion, stating that many workers have not returned while repairs are made.