PORTLAND — Police collected additional evidence from a wooded area in Northport in connection with their investigation into the disappearance and death of a Portland woman.

Authorities returned to the spot where the partial remains of 24-year-old Elena Lozada were discovered earlier this month. Members of the Portland Police Department, Maine State Police, the Maine Warden Service and the state Medical Examiner’s Office spent much of Monday in the Waldo County town.

The case is still being investigated as an unattended death with suspicous circumstances.

Lt. Gary Rogers, head of Portland police’s detectives, would not provide additional details about the evidence found at the site off Route 52. The privately owned property is south of Black Belmont Road. Rogers said he believes authorities’ work at the site is finished following a thorough search Monday.

The property owner is not a person of interest in the investigation and none of the owner’s family members are either, Roger said.

Rogers would not say how authorities were led to the site.

Lozada was reported missing in July by her mother, Carrie Cronkite of Westfield, after she had been out of touch for an unusual length of time. Cronkite has said that Lozada had recently been discharged from a hospital drug rehabilitation program but refused to enter a residential program as her mother had hoped.