FREMONT, Ind. — A chemical leak has forced the closure of a highway in northeastern Indiana and southern Michigan.

A tanker truck leaked about 6,000 gallons (22,712 liters) of liquid nitrous acid after a valve broke at a truck stop in Fremont, Indiana, Steuben County Emergency Management Director Randy Brown told WANE-TV.

Interstate 69 in both states was shut down about 10 a.m. Tuesday.

Brown said the chemical poured into a ditch along the highway. Lime was being applied to the liquid in the ditch.

Some nearby side roads also were closed.