Iowa natural resources officials are investigating a fungicide spill and subsequent fish kill in a central Iowa creek.

The state Department of Natural Resources says an unknown amount of fungicide spilled from a truck Monday afternoon at the intersections of state Highways 163 and 316. Some of it reached Camp Creek, where department staff found dead minnows and chubs downstream of the spill site.

Officials say the creek fish kill began east of Pleasant Hill and extended about five miles north of Runnells in Polk County.

Department officials are working to determine if the fungicide can be prevented from reaching the Des Moines River.