Police say the fake threats were made after the professor was told he was losing his job.
Chief Riggs issued a statement to his department following the shootings Sunday, saying the two will "ensure that any threats are thoroughly investigated."
The threat was posted to the school's Instagram account Tuesday.
The Indiana Department of Natural Resources say reported sightings are coming in around central Indiana, but there is no reason to be alarmed.
Monroe County Public Library received a bomb threat earlier today. It has now been reopened.
Authorities are investigating a threat written in the bathroom of a Bloomington middle school.