The graffiti, which was found last week, included a threat of violence with reference to Nov. 13.
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Campus police investigated and say the threat is not credible and the campus is safe and will be open.
CSULA issued a statement on Twitter early Wednesday morning.
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The threat was the second at the campus in less than two weeks.
The university said on Nov. 4 a threat was rumored to target the library. However the threat was deemed "unsubstantiated" and "unconfirmed," according to school officials.
A third reported threat was a rumor.
An earlier version of this story stated there were three reported threats. Since then, CSULA has clarified that the third reported threat was a rumor.