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Student Jordan Eckermann, who was in a second-floor classroom in the business school when the rampage began, said the timestamp on a short cellphone video he recorded showed the building’s alarm went off at 11:48 a.m., three minutes after the shooting started.

Minutes later, when he was outside, Eckermann said he heard bursts of gunshots, totaling at least 20 rounds.

Another student, Jordan Eckermann, 25, said he was in his business law class in a second-floor classroom when he heard a loud bang and a piercing alarm went off, sending students to their feet.

Some ran from the room in panic while others heeded their professor’s instructions to stay calm, said Eckermann.

Swedish riders Henrik von Eckermann and Malin Baryard-Johnsson joined Fredricson in earning the gold medal.