Valparaiso University has warned students on its website and increased security after receiving a vague threat through a graffiti message.
The school says the threat claimed "dangerous and criminal activity" would occur on the northwest Indiana campus during the university's daily chapel break period Friday. The message provided no details.
The school says the FBI and local authorities searched the campus but found nothing suspicious.
University spokeswoman Nicole Niemi said classes and other regular activities were continuing as planned.
The university tweeted that Valparaiso did not receive a bomb threat as schools in Texas and North Dakota did and called its situation "substantially different."
Indiana Homeland Security spokesman John Erickson declined to say if any other Indiana schools had issued similar alerts.