LITTLE ROCK, Ark. (AP) — A chlorine gas leak that sickened nearly 200 people at a Tyson Foods plant in Arkansas last year happened because a worker who couldn’t read the English-language label on a barrel of chemicals inadvertently poured bleach into it, the Centers for Disease Control and Prevention said in a report released Thursday.

Tyson Foods disputed the report, saying federal investigators misidentified the worker who caused the accident. Company spokesman Gary Mickelson told The Associated Press the worker who mixed the chemicals speaks English as his primary language and was able to read the label, but didn’t.