(STMW) — A baby boy was found dead, wrapped in a plastic bag in a Northwest Side gangway Saturday morning.

About 8:30 a.m., the boy — described as a newborn — was found in a gangway in the 2700 block of North Hamlin Avenue, according to police and the Cook County Medical Examiner’s office. He was pronounced dead at the scene.

A police source described the baby as a “full-term male infant” who was 1 day old.

The baby’s identity was not known Sunday and an autopsy was inconclusive pending further studies, according to the medical examiner’s office.

Detectives would not comment on the investigation.

(Source: Sun-Times Media Wire © Chicago Sun-Times 2014. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)