By CBSLA Staff

EL MONTE (CBSLA) – Officials at Arroyo High School in El Monte discovered graffiti in a bathroom indicating that a school shooting would take place on Monday, November 1.

Police were notified to determine the credibility of the message.

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(credit: CBS)

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Authorities at the El Monte Police Department told CBSLA they were aware of the graffiti message and said the matter is under investigation.

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The department also said it would have extra patrols at the school tomorrow.