A massive crowd of University of Pittsburgh students gathered to party directly in front of the Semple Street house, where a porch roof collapsed the day before due to the weight of people partying on top of it.

No one was killed when the porch roof caved in behind the house in the 300 block of Semple Street. But 16 people were taken to hospitals for treatment — most of them with arm and leg injuries as well as concussions — and at least a dozen others were treated at the scene,