(Radio Iowa) – Outdoor burning is now banned on 61 Iowa counties and fire departments in western, central and eastern Iowa have battled field fires in the past few days. Investigators have not determined the cause of a Thursday afternoon fire between Lake Park and Spirit Lake. Lake Park Fire Chief Brandon Ehret says luckily no homes or buildings caught fire. “When we got there…it had jumped the gravel road and was moving north at a high rate, probably burned about three-quarters of a mile north,” he says. “…Then we did some back burning to the grasslands to the south of it and basically got it stopped from going any farther north.”