University of Arizona police investigate stickers with racist and hateful messages left on campus.

University of Arizona police are investigating the appearance of several stickers with racist and hateful messages on campus.

Police said they received reports on June 30 of stickers that promoted white supremacy and contained threatening messages. Five stickers were seen on light poles, a building and an electrical box on the western edge of the Tucson campus near Second Street and Park Avenue.

They have since been removed, and police said the special investigations unit was actively working on the case.

Police did not describe the content of the stickers, but two UA football players, Issaiah Johnson and Mykee Irving, posted photos of the stickers to their Twitter accounts. The stickers addressed a white audience, saying, “Kill a black on sight,” and “Your very survival is at stake white man.”

The text was centered around a Celtic

Cross — a symbol used frequently by neo-Nazi and white supremacy groups, according to the Anti-Defamation League.

“Even seeing this makes me sick to my stomach,” the caption of one photo posted by Johnson said. “If you’re Black in Tucson please be safe.”

Neither Johnson nor Irving responded to requests for comment Thursday.

UA was faced with a similar problem last month when postings from Patriot Front were seen on campus. The Southern Poverty Law Center defines Patriot Front as a white nationalist hate group.

Pam Scott, a spokeswoman for the University, told The Arizona Republic in June that the signs did not comply with the campus guidelines for posting fliers and were removed.

UA did not respond to additional requests for comment by publication.