MOORHEAD, Minn. (AP) - Authorities say at least 11 people were injured south of Moorhead when anhydrous ammonia leaked from a tank being pulled by a farmer.

Clay County Sheriff Bill Bergquist says their injuries are not believed to be life-threatening.

Bergquist says the farmer was working a field on the south side of 60th Avenue on Sunday evening and was pulling a tank of the chemical when the hitch on the tank broke. Some chemical escaped from the tank before the farmer could close a valve to shut off the leak.

Authorities say at least three vehicles drove into the toxic cloud.

Carrie Haug, spokeswoman for MeritCare Hospital in Fargo, N.D., says patients complained of symptoms such as a burning feeling in the chest, shortness of breath, and watering and burning eyes.