Authorities say two well-developed human fetuses, apparently twins, were found dead along a road near a San Diego County church.

Sheriff's officials say a man called 911 Friday afternoon to report the gruesome discovery in Fallbrook.

The man said he initially thought it was a doll wrapped in a blanket.

Paramedics confirmed that the two fetuses were dead. Homicide detectives are investigating.

Sheriff's Lt. John Maryon says the fetuses were well-developed and appeared to be five months along or older.

The cause of their death wasn't immediately known. An autopsy is planned.