LAKEVILLE, Minn. - An unusual discovery in a Lakeville park has police there urging caution.

A person walking the grounds of Antler Park, 9740 201st Street West, on Wednesday came upon a bright yellow golf ball near the volleyball courts. It wasn't your ordinary wayward ball: This one had a number of nails driven through, with sharp points protruding.

That person called Lakeville Police, who searched the grounds but were unable to locate any more of the altered golf balls. Still, the ball presented a significant hazard to anyone walking barefoot, and could be extremely dangerous if thrown.

Lakeville PD posted a picture of the nailed golf ball and a warning on its Facebook page.

Authorities are asking anyone who finds a similar item or witnesses suspicious activity to call 911.