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.

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 said.

“We were aware that police forces were gradually clearing the floors

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