A construction crew found what appeared to be human bones at a site near a local highway Tuesday afternoon.

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Construction Worker Describes Discovery Of Bones

The crew was pounding through about 5 inches of concrete while digging a drain along the Davison Freeway when they found what appeared to be the spine and rib cage of a human, Local 4 reported.

"It kind of looked like human bones, didn't look like an animal, so we called the police," said Jim Siarkowski, a construction worker.

Detroit police say they're working on the assumption that it's a human, but they're unclear if it's a man or a woman, the station reported.

Medical examiners are expected to run tests on the remains.

Construction workers told Local 4 that it's been quite some time before concrete was poured in the area, so the body may have been buried there for over 20 years.