An anhydrous ammonia leak at a JBS USA plant in Louisville, Ky., forced 1,000 employees to evacuate and nearby residents to stay indoors for hours on Wednesday. One worker, a 40-year-old man whose name was not released, was sent to the hospital after complaining of burning eyes, nausea and vomiting, Louisville Fire Department Capt. Salvador Melendez said. There were no other reported injuries, reports the Associated Press.

The plant was evacuated after an accident in the plant’s engine room, and sirens were set off to warn residents when authorities determined they could be at risk. People living within a mile of the facility were warned to stay indoors and avoid using heating or air conditioning. The leak was stopped about 2-1/2 hours later, and an all-clear notice was issued to the area residents.

Source: Associated Press