Nine people were sent to the hospital after a garage roof they were reveling atop collapsed Saturday during an early St. Patrick’s Day party at California Polytechnic State University.

The Cal Poly annual event spiraled out of control caughting authorities and campus officials off-guard.

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roof-collapse St. Patricks Day Polytechnic State 3

Several thousand students, most wearing green, poured onto campus Friday night and were still partying as the sun rose on Saturday. That’s about the time when the roof with about three dozen people standing on it collapsed as screams and gasps could be heard from throughout the party. The most serious injury? A person’s thigh was impaled by a piece of debris early Saturday, the city said in a statement. Eight others were treated for cuts and bruises. None of the injuries are life-threatening. h/t theblaze

Police Capt. Chris Staley says three people were arrested for misdemeanors as his department and the San Luis Obispo Fire Department brought the scene under control a few hours after the collapse.