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Authorities evacuated an academic building at the University of Notre Dame following a small chemical explosion in a laboratory.

University spokesman Dennis Brown says the explosion occurred Monday morning on the third floor of the Stinson-Remick Hall of Engineering.

He says “a staff member was working with some acidic solutions and there was a small explosion. The acid washed up onto her so she was treated immediately.”

Brown says the unidentified staff member was transported to a hospital as a precaution.

The building was expected to reopen later Monday.