STAMFORD, Conn. (AP) -- Stamford police are investigating the discovery of two human skulls at a garbage-processing station.

Police Lt. Diedrich Hohn (home) says the skulls were found Thursday afternoon at a transfer station along with books on Satan and witchcraft.

Hohn said Friday that the skulls are at the state medical examiner's office for further examination. He said it remains unclear where the remains came from, how the people died and how their remains ended up at the transfer station.

The skulls were found by a worker who was sifting through the refuse. Authorities later confirmed the skulls were human.