The injuries sustained by the girl are believed to have made an identification impossible prior to the release of autopsy results expected on Wednesday.
Police have no suspects in the case.
Only after a post mortem examination will police be able to ascertain how the girl was killed and whether she was subjected to a sexual assault.
The girl was almost completely naked when her body was discovered by construction workers in Mora. The body was found hidden under insulation materials located behind a storage container.
Investigators are working on the theory that the victim may have been a 15-year-old girl who was reported missing from her home in the town on Saturday.
The girl was last seen alive at 7pm on Friday when a family member dropped her off at a bus stop in Mora. Her father had been expecting her to pay him a visit in Älvdalen but his daughter never arrived.
A thorough search of the girl’s computer revealed that she sometimes arranged meetings with people she came into contact with on the internet.
“We are now trying to find out if she made an appointment with somebody on Friday,” said police spokesman Sven-Åke Petters.