DECATUR, Neb. (AP) — The occupants of all but one northeast Nebraska house have been allowed to return to their homes days after they were evacuated because of an anhydrous ammonia leak that killed a local farmer.

Magellan Midstream Partners, of Tulsa, Oklahoma, made that announcement Saturday.

Magellan has been repairing an 8-inch-diameter pipeline that carries anhydrous ammonia, used as a farm fertilizer. When released from a tank or pipe, it becomes a lethal gas that can cause severe chemical burns and damage the tissue of the eyes, nose, throat and lungs.

Authorities have said 59-year-old Phillip Hennig, of Tekamah, was killed by the fumes Monday night while checking on the leak.

Magellan says it is conducting additional air quality testing at each residence as occupants return to ensure safe air quality.