Valparaiso University in Indiana has increased security and posted a warning to students on its website after receiving a vague threat through some graffiti.

The school says the threat claimed “dangerous and criminal activity” would occur on campus during the university’s daily chapel break on Friday. The message provided no details.

The school says the FBI and local authorities searched the campus but found nothing suspicious.

University of Texas Austin junior Salimah Jasani was on her way to a 10 a.m. class when she received an emergency text message from the university, but she ignored it – it wasn’t until she saw a missed call from her roommate that she began to suspect something was happening.

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