A human skull was found Saturday afternoon in a wooded area of Ronkonkoma, Suffolk police said.
A bicyclist discovered the skull and remains in the woods off Express Drive North at about 12:15 p.m., police said.
Authorities said the remains had been in the woods for a long time and have not been identified.
Police have not determined whether a homicide occurred.
Anyone with information is asked to call homicide detectives at 631-852-6392 or Crime Stoppers at 800-220-8477.