CLEMSON, S.C. — Clemson University police are investigating the discovery of Ku Klux Klan recruitment fliers that appeared around the South Carolina school’s campus recently.

The Clemson University Police Department said in a news release that officers have increased patrols following the appearance of the flyers over the weekend as well as three separate reports of students being subjected to racial slurs Monday while walking across campus.

Authorities say officers stopped and identified the individuals responsible in two of those three cases. None had ties to the university.

The KKK fliers were found inside several clear, zipped bags. Investigators believe they were dropped from a moving vehicle.

Police said they are in contact with local, state and federal law enforcement partners regarding the incidents.