Vaca Rural Fire District, Dixon Fire and a host of other local fire agencies are responding to a grassland fire in the 4300 block of Peaceful Glen Road, north of Vacaville.

The blaze is now a four-alarm call and firefighters on scene are reporting moderate winds whipping the flames.

The call came in around 1 p.m. with a report of structures threatened.

Meanwhile a second fire is burning in the area of Highway 12 and Brannon Island.