Emergency personnel were called to the Emmi Roth cheese production plant in Seymour, WI Saturday evening for an airborne anhydrous ammonia release, Outgamie County Emergency Management announced in a statement on Facebook.

Crews were dispatched to the Bronson Road facility at 7 p.m. “Upon arrival, signs of an ammonia release were observed, and emergency personnel began evacuation of residents in the immediate area of the release,” the agency’s release said.

A HAZMAT team and firefighters worked to contain the release and the evacuation order was later lifted. Local television news station WBAY said the leak was controlled by 11:38 p.m.

An investigation into the cause of the release is underway.

Emmi Roth acquired the Seymour plant from Great Lakes Cheese in 2019. The facility produces blue cheese.