SAN RAMON (CBS SF) — A close call at an East Bay high school Monday after police arrest a freshman who officers said was armed with a knife and explosive components.

Police were called to Dougherty Valley High School in San Ramon Monday morning after classmates told school staff another student had a knife.

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Officers located the student, discovered the knife and also found the student to be in possession of an acid that can be used to create explosives.

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The 14-year-old was booked into juvenile hall in Martinez.

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No word yet on that student’s identity. Police said there are no additional threats to the school.