A wildfire burning near Elgin has grown to about 800 acres, but is 75 percent contained, officials said Thursday.

The fire, burning primarily grassland, was first reported on Wednesday about 3 miles southeast of Elgin.

Forty-two firefighters are assigned to the fire, along with several engines and air tankers. One power line and a vehicle have been burned in the blaze.

No structures are threatened.

Sonoita-Elgin Fire Department chief Joseph DeWolf said the fire was caused by a vehicle parked in high grass.