Minnesota's Department of Natural Resources says it's investigating a report of potentially illegal hunting activity on land owned by the dentist who was sharply criticized for shooting a well-known lion in Zimbabwe.

Leah Thompson hunts on land in northwestern Minnesota next to property owned by Bloomington dentist Walter Palmer. She told KVLY-TV she saw vehicles chasing deer on his property several times last weekend during the deer season opener.

It's illegal in Minnesota to chase or herd deer with a motor vehicle. Thompson says she saw pickup trucks herding deer back onto Palmer's property.

Palmer issued a statement Thursday saying he wasn't on the property after 11 a.m. Saturday, and didn't operate any of the vehicles described in the complaint. He called the complaint an attack on an innocent man.