The University of Massachusetts in Lowell is stepping up security as classes resume Thursday, after reports of someone with a gun on campus put the school on lockdown Wednesday, the first day of classes.

Video of a man walking near a dorm room with what looked like a gun triggered a campus lockdown, with students barricaded inside dorm rooms and lecture halls and officers swarming the campus.

“Personally my heart was beating out of my chest,” said freshman student Harlem Meade-Draves. “I didn’t know what was going on some people were crying some people were panicking.”

UMass Lowell police confirmed video recorded by a student, along with surveillance camera on a residence hall, picked up the suspect; they said no shots were fired.

After about three hours, police determined the suspect

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