Celebratory riots have plagued college campuses over the last decade, especially on St. Patrick’s Day or following sporting events, said Jack Levin, professor of sociology and criminology at the Brudnick Center on Violence and Conflict at Northeastern University.

“Rioting has for years been a fad on college campuses around the country and has often been inspired by rioting on another campus,” he said.

“The most important factor is that participants feel invulnerable and anonymous,” he said. “Their individual actions get lost in a sea of screaming and shouting students. In the thinking of rioters, there will be no negative consequences for them.”