A preliminary autopsy has revealed no signs of physical trauma or sexual assault on a Chelsea woman whose remains were found near a highway onramp this weekend, Suffolk County District Attorney Daniel F. Conley and Chelsea Police Chief Brian Kyes said today.

State Police homicide detectives assigned to Conley’s office and Chelsea Police detectives continue to investigate the 48-year-old woman’s death. Her body was found Saturday near the ramp leading from Route 1 southbound onto Route 16 westbound. There were no immediate signs of violence at the scene.

The Office of the Chief Medical Examiner has ruled the cause of woman’s death inconclusive pending further specialized tests, including toxicology screens, which are expected to take several weeks.

A group of children playing in the rear of an Exeter Street residence discovered the remains just off the roadway at about 4:10 on Saturday afternoon. Chelsea Police responded to the scene and, as is the case for all unattended deaths in Chelsea, notified the Suffolk County State Police Detective Unit, which has jurisdiction over all death investigations in that city, Revere, Winthrop, and parts of Boston.

The deceased was known to Chelsea Police and had a history of substance abuse. She is not being identified until and unless her death is ruled a homicide.