BLOOMINGTON, Ind. (AP) — Indiana University is cleaning up inside a residence quadrangle after mold was found in units.

Patrick Connor, executive director of residential programs and services, tells The Herald-Times students identified the problem when they began moving into Teter Quadrangle in August.

The mold originally was thought to be in only one of the Teter buildings, but the university’s director of environmental health and safety, Dan Derheimer, says it has been found in all of them, with Teter Wissler being the most contaminated.

Students living in rooms where mold was visible were moved to lounges during the cleanup. Only one student was still living in a lounge as of Thursday.

All of the approximately 650 units are being cleaned as a precautionary measure. The cleanup is estimated to cost $84,000.