There were no injuries to suggest “any other person was involved” in the death of missing teenager Gaia Pope, police have said.
Dorset Police is treating her death as “unexplained” pending toxicology results.
Det Supt Paul Kessell said: “The post-mortem examination has not identified any injuries to suggest any other person was involved in her death.
“The cause of death is undetermined, pending toxicology. The coroner is involved in the oversight of these examinations but at this time this remains an investigation into an unexplained death.”
Miss Pope, who had severe epilepsy, had not been seen since 7 November.
‘I am heartbroken’
Items of clothing she was wearing on the day she went missing were found on Thursday, close to where her remains were found near a coastal path.
Det Supt Kessell added: “I reiterate this area is steep and slippery in an exposed area close to sea cliffs. The area is covered in dense undergrowth and gorse and can present a hazard.
“The area where the body was located is likely to remain cordoned off for some time while forensic examinations and searches are concluded.”
On Facebook, she added: “Can’t find any words right now. Gaia is my everything and I am heartbroken. I thank everyone who was involved in searching for my beautiful twin.”
Floral tributes have begun to be left on the Alfred Monument, next to the sea front.
“We are absolutely devastated, and unable to put into words our feeling of loss,” she wrote on social media.
On the day she went missing, Miss Pope was seen at about 15:00 GMT buying an ice cream at St Michael’s Garage, having been driven there by a relative.
She was then spotted an hour later on CCTV in Manor Gardens, off Morrison Road.
Rosemary Dinch, 71; her 49-year-old son Paul Elsey; and 19-year-old grandson Nathan Elsey – all of whom were known to Miss Pope – were questioned by detectives and released under investigation.