"Investigators reviewed surveillance footage and conducted interviews but were not able to collect any new information or leads in the case," he said. "The investigation is on hold until any new information is found."
Part of the 18,000-student Muncie campus was locked down for more than three hours after several people in the Health and Physical Activity Building reported hearing a man shout "Gun! Gun! Gun!" followed by a door slam.
A police search of several buildings involving about 40 officers turned up no sign of a weapon or evidence of a threat.
Proudfoot said anyone with information about the incident should call campus police.
Proudfoot said the November search, as well as the Jan. 21 fatal shooting and stabbing of a Purdue University student, has given Ball State officials "pause to review" their plans for reacting to possible active-shooter situations.
"The shooting at Purdue was a tragic event that, unfortunately, we understand is an all-too-real possibility," he said. "Whenever such an incident occurs on a college campus, especially one in Indiana, we take time to review emergency procedures and ensure that we are prepared to protect our community in a similar situation at Ball State."