SIOUX FALLS, S.D. (AP) — The body of a baby boy was found at a South Dakota recycling center, and police are trying to determine how the child died and how the body ended up at the center.

An employee of Millennium Recycling in Sioux Falls called police Tuesday morning. The exact age of the child was unknown, said police spokesman Sam Clemens. It wasn’t clear how long the body had been at the recycling center.

A statement from Millennium Recycling said the company is “providing full support to our staff,” but declined comment on the investigation.