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The National Socialist Movement, one of the largest neo-Nazi groups in the United States, has chosen the Pennsylvania Capitol in Harrisburg as the location for their Fall Political Rally. (AP file photo)

The fliers included messages like "How is a diploma going to help you in the race war," "Imagine a Muslim free America," and "Stop the blacks." And according to officials at the University of Pennsylvania in Philadelphia, they began appearing on campus over the weekend, believed to have been placed there by "off-campus groups bent on sowing fear and discord."

Photos of the posters show the web address IronMarch.org included at the bottom. IronMarch.org identifies itself as a "global online fascist community" and the Nazi version of Facebook.

Similar fliers bearing the IronMarch.org insignia appeared at Boston University last year, those ones reading "Black lives don't matter" and "The Atomwaffen Division Massachusetts."

There were also reports of similar materials discovered at universities in Chicago and Virginia last year, and the IronMarch.org site was also reportedly tied to threats against at least one University of Washington professor.

At University of Pennsylvania in Philadelphia, spokespeople said the fliers had been taken down since appearing there over the weekend.

"Expressing hate or animus for any group of individuals is vile and reprehensible," read an email from university officials reported on by Philly.com. "We underscore our commitment to a supportive, respectful, diverse and open campus, and we encourage the exercise of free expression rights to counter misguided hate with stronger words of truth and mutual respect."

The Daily Pennsylvanian, UPenn's student newspaper, reports that a Twitter user with the handle @Illegal_Aryan seems to have taken responsibility for posting the fliers at UPenn over the weekend. @Illegal_Aryan has also since posted links to news coverage of the incident.

Ski goggles and a bandana obscure Illegal_Aryan's face in his profile photo, and the image at the top of the account's page shows "Pepe the Frog," a symbol of the so-called "alt-right."

The account also links to The Daily Stormer, a neo-Nazi blog that was found to be responsible for racist flyers posted around Texas State University's campus, the Philly Voice adds.

Discoveries like these come amid a reported wave of racist incidents on college campuses nationwide. They also coincide with new research from the World Jewish Congress indicating anti-Semitism on college campuses has skyrocketed, while anti-Semitic acts of violence have fallen.