First-year Brown University Benjamin DiBella was in the Sciences Library at the Providence college Saturday afternoon when someone yelled that there was an active shooter on campus.

There was — but in a nearby building, Barus & Holley, where a gunman opened fire on people in a classroom, authorities said, killing two and wounding nine others. The manhunt for the shooter was ongoing early Sunday.

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DiBella went to the messaging board Sidechat, “and saw dozens of messages all only minutes old noting panic and gunshots,” DiBella said.

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What followed was a lockdown on the 9th floor, where doors were barricaded and people scrolled news feeds for information over the next two-and-a-half hours, he sai

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