STANFORD (CBS SF) — The discovery of “suspicious items” inside an academic building on the Stanford University campus Monday triggered the evacuation of students and a warning to stay clear of the area, authorities said.

Two hours later, the school’s Department of Public Safety re-opened the building and lifted the warning after the items were deemed not dangerous.

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Officers wrapped up the investigation on scene after learning the items were related to the Stanford Online High School, according to an alert posted at 9:57 a.m.

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Cordura Hall, the building that students and faculty were evacuated from around 8:15 a.m., has been reopened and Panama Street was now open to traffic. Police closed Panama Street from Campus Drive to Via Ortega for the investigation.

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Cordura Hall houses the Center for the Study of Language and Information, where Stanford faculty and students focused in psychology, linguistics, philosophy and more can come to collaborate, according to the CSLI-dedicated page on the university website.