HILLSBORO, N.D. (AP) — Snow contaminated with diesel fuel and canola oil has been removed from atop the frozen Elm River in eastern North Dakota, following a semitrailer crash.

The state Health Department says the semi slid off a bridge over the river south of Hillsboro on Monday. About 10 gallons of diesel and an unknown amount of canola oil that was being hauled spilled onto the snow over the river.

Health officials say the snow has since been removed, and they're continuing to monitor the site.