STATE COLLEGE, Pa. (AP) — The Berkey Creamery at Penn State is warning patrons that plastic pieces and a penny have been found in containers of ice cream.

Creamery officials say one customer found a penny in a container bought in mid-May. Penn State police thought it an isolated incident until three other customers complained of plastic in their containers.

No injuries have been reported.

Creamery manager Tom Palchak says the plastic pieces aren’t components from machines used in production. He says officials are now limiting access to ingredients and increasing surveillance at the production facility.

The Food and Drug Administration is also involved in the investigation.

The creamery produces ice cream, cheese and other dairy products, much of it using milk from the university’s herd.

Berkey bills itself as the nation’s largest university creamery.

(Copyright 2012 by The Associated Press. All Rights Reserved.)