DEDHAM – More bones were found Friday in the woods off Green Lake Road, but police say they are no closer to determining whose bones they were or how the person may have died.

Dr. Marcella Sorg, an anthropologist with the University of Maine who is assisting police with the investigation, said Friday the bones most likely were those of a woman approximately 20 years old. She said the bones police have found since a hunter brought a skull to them from the site last fall include bones from the woman’s spine and foot. The bones likely have been at the site for at least 10 years, Sorg said.

Sorg and Maine State Police Detective Joe Zamboni said they did not want to be specific in identifying the bones and personal belongings found.

“We really haven’t found a lot,” Zamboni said, as other investigators looking for more evidence dug through the topsoil and sifted through dirt behind him. “All we know is somebody died out here. We don’t know who they are.”

Police have not ruled out the possibility that someone could have placed the body where the bones were found, but he said it is still too early in the investigation to determine whether the person died naturally or was killed. The most police can focus on now is trying to identify the woman, he said.

Zamboni said investigators with various agencies had used pink and yellow tape to mark off an area in the woods of about 1,000 square feet as they looked for clues to the woman’s identity. Those helping with the search are all part of the state’s newly formed evidence recovery team, he said.

Zamboni said the bones were found within a 20-foot diameter, but the area being searched will grow as the investigation continues.

“We will continue to expand and do this as long as we can,” the detective said.

Police have a list of names of four or five missing women whose remains could be those found in Dedham, Zamboni said, but no positive link has been made between any of those women and the bones.

Sorg said the characteristics of the bones lead her to believe they came from a woman. The bones are “mature,” she said, indicating they came from an adult.

“She was sort of short,” Sorg said. It is possible that the woman may have been in her 30s or older, she said.

The bones have been moved since the woman died, but this could have been done by animals or by natural elements such as wind or water, Sorg said. The displacement of the remains probably was not caused by a person, she said.

“It’s almost certainly a natural phenomenon,” Sorg said.

Zamboni said the evidence recovery team had proved helpful in the search. The number of people involved, including homicide investigators with the Bangor and Portland police departments, has made it easier to clear underbrush at the heavily wooded site and to maintain consistent attention to the investigation, he said.

Without a pool of people from several agencies to help out, the search effort likely would be left to a few state police detectives who work in the area, according to Zamboni.

“It’s a huge benefit to police,” he said.