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Multiple buildings were evacuated and closed on the University of Delaware campus Wednesday after researchers accidentally created “a small amount of a shock-sensitive explosive chemical” in a campus laboratory, according to the Delaware News Journal.

Delaware State Police deployed an explosive ordnance–disposal unit to remove the substance from the laboratory and conduct a controlled detonation on the campus’s South Green. Hundreds of students initially gathered to catch a glimpse of the detonation after police notified the campus about the incident, but only about 50 remained by the time it finally occurred, according to the News Journal. No injuries were reported, and the buildings reopened Thursday.