Pleasanton police and county coroner's officials are still working to confirm the identities of two people whose bodies were found inside a car parked on Pimlico Drive on Saturday morning, but the conclusion is now that the pair had been dead for about a month under unclear circumstances.

Investigators believe the man and woman were both in their 20s or early 30s, according to Pleasanton police Lt. Erik Silacci, who said they hope to be able to confirm the decedents' identities by the end of the week.

Based on evidence obtained so far, as well as the level of decomposition of the bodies, investigators now believe the two people had been dead for about a month and the Acura TSX had been parked next to the soundwall on Pimlico Drive for that same time, Silacci told the Weekly on Tuesday. Police initially reported that it appeared the decedents had been dead for "at least more than a week."

There were no obvious indications of foul play, external trauma or suicide in the vehicle or around the scene, but no potential cause has been ruled out yet, according to Silacci.

The discovery was made after police dispatch received a call at about 9:45 a.m. Saturday from a passerby reporting they saw a person unresponsive in a car parked next to the soundwall on Pimlico Drive. After arriving at the scene near the Keneland Way intersection, officers found two people -- an adult male and an adult female -- inside the Acura TSX who were dead, Silacci said.

The lieutenant said that to his knowledge the Saturday morning call was the first time the Acura's presence had been reported to Pleasanton police. It remains unclear how the Acura with two dead people inside sat unnoticed for weeks.

The car was parked on the soundwall side without a sidewalk on Pimlico Drive, which runs parallel to Interstate 580 in that segment, and the bodies -- which were in the front seats -- were set back inside and would not have been easily seen, according to Silacci.

The police department and the Alameda County Coroner's Bureau are conducting investigations into the deaths. Silacci said anyone who may have seen the Acura or have evidence related to the case should contact Pleasanton PD at 925-931-5100.