CHICAGO (AP) — Authorities say they have yet to determine the cause of death of a woman, whose body was found in a South Side Chicago garbage bin.

City trash collectors discovered the woman's body Monday, as they emptied the bin into a truck in an alley in the Brainerd neighborhood. It was unclear how long the woman's body had been in the bin, but a Chicago police spokeswoman said it had no obvious signs of trauma.

Investigators describe the remains as those of an African-American female of an unknown age.

An autopsy performed Tuesday was pending the results of the tests, which would determine whether drugs or other chemicals played a role in the woman's death. Authorities say it may be a month before test results are available.