HESSTON, Kan. (AP) — A chemical spilled at a plant in south-central Kansas, sending about a half dozen people to the hospital.

The Hutchinson News reports that the spill occurred Thursday morning at the GVL Poly Plant in Hesston.

Gary Denny, director of emergency management for Harvey County, says a building at the plant was evacuated after a breach of a container with a chemical used in manufacturing coolers. He says the chemical — polymethylene polyphenyl isocyanate — can be hazardous if it’s inhaled. He says it’s unclear how much escaped.

Denny says three people were taken to the hospital by ambulance, and three people went to the hospital on their own. The hospital says one person was admitted for observation, and the others were treated and released.