Around 2,000 Berkeley High School students walked out of class Thursday to protest a racist message left on a computer in the school library. The computer screen displayed an image containing racial epithets and language threatening violence against African-Americans, which a student later admitted to posting. Protest organizers say the incident is not an isolated one: In December, a noose was found hanging from a tree on campus, and the school's 2015 yearbook was recalled after it was found to contain an offensive comment.

• More: KQED: Racist Message on Berkeley High Library Computer Spawns Mass Protest
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