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Anthropologists are investigating bones unearthed during construction at the University of Utah.

Construction crews stumbled upon the bones Wednesday morning while working on a major renovation of the Salt Lake City school's original library. The bones are believed to be human, but university spokeswoman Maria O'Mara says university police quickly determined that it wasn't an active crime scene but some sort of historic or prehistoric site.

The building where the bones were discovered was constructed in 1936. State forensic anthropologists are determining how long the skeletons have been there and if there are more in the area.

Although groundwork has stalled, work will continue inside the structure. The building will become the University of Utah's new College of Science in fall 2017.