UC Irvine's chancellor pledged Wednesday to find and discipline whoever slipped a racist note into a black female student's backpack last week.
The student found the note, which read "Go back 2 Africa slave," while she was in the science library on May 7, according to UCI police.
The department is investigating what it is calling a hate incident.
"When apprehended, the responsible individual(s) will face appropriate sanctions," Chancellor Michael Drake said in a statement on UCI's website.
"We have clear and unwavering policies forbidding such hateful actions, and we take the security and well-being of everyone on campus most seriously. We do not, and will not, tolerate this kind of behavior," Drake said.
The campus, which is 2.6% African American, garnered nationwide attention last month when a fraternity posted a video in which one of the characters was in blackface. Members of the Black Student Union called it an example of racial insensitivity.