SIBLEY, Iowa — Authorities are still trying to round up some wayward buffalo that escaped from a ranch in northwest Iowa.

About 200 buffalo broke out of their pen at the Frick and Joe Buffalo Ranch in Sibley on Sunday. The animals have since been spotted in five counties — Lyon, Osceola, Sioux and O’Brien counties in Iowa and Nobles County in Minnesota.

Lt. Seth Hofman of the Osceola County Sheriff’s Office says the buffalo are “really, really fast.”

Officials have corralled most of the herd, but more than 30 are still on the loose. One was seen early Wednesday near Sheldon, some 20 miles south of Sibley.

No injuries have been reported, but motorists are asked to be careful while driving in the area.