The FBI and ATF are investigating a nonspecific threat against universities near Philadelphia that now has schools on edge.

An anonymous user posted a threat on 4chan that praised the gunman who opened fire on the campus of Umpqua Community College last week, WPVI reported.

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Nine people were killed at the Roseburg, Oregon school Thursday, Fox News reported.

The post called the shooter a fellow member of the "Beta Rebellion."

The post read, "On October fifth, at 1pm Central time, a fellow robot will take up arms at a university near Philadelphia," WPVI reported.

The post also included a warning.

"If you are in that area, you are encouraged to stay home and watch the news as the chaos unfolds," Fox News reported.

Schools like Temple, Drexel and the University of Pennsylvania said the threat isn't specific, but they are urging students to be on alert.

Temple officials said law enforcement will have increased visibility on campus Monday.