A wildfire west of Nogales, Ariz., has burned about 160 acres, according to Coronado National Forest officials.

The Juniper Fire began Sunday afternoon about 18 miles west of the border city.

The fire is burning in grass and low brush, with low fire activity, according to a news release.

Three firefighting crews and four engines are assigned to the blaze.

There are no closures associated with this fire; no structures are threatened.