About 30 people were injured late Saturday after two decks collapsed on top of a third during a house party near Trinity College in Hartford, Conn. 

No serious injuries were reported in the collapse, which happened at around 11 p.m. local time. 

Hartford Police Department Deputy Chief Brian Foley posted on his Twitter feed that a third-floor deck of a house about two-tenths of a mile from the Trinity campus collapsed onto a second-floor deck, which subsequently fell onto a first-floor deck.

The injured were sent to five area hospitals, Foley said, with the most serious reported injuries being a broken arm and a head injury. He described those hurt as “walking wounded” and said most were students.

“That’s some pretty weighty decks that fell down,” Foley said. “We’re very lucky there weren’t worse injuries.”

Foley said the third-floor deck that fell showed signs of deterioration. He added that the building was owned, but not managed, by the college.

“At this point, the third floor, you look and see the wood was very rotted and very old and structurally not very sound,” he said. “Then you get 50 or 60 kids partying out there and it’s obviously a dangerous situation.”

Hartford Mayor Luke Bronin said in a statement that “we are very lucky that there were no fatalities … from what could have been a truly tragic incident.”

The mayor said police and firefighters were on the scene within minutes of the accident and that first responders worked quickly to get the injured transported to hospitals.

Trinity College is a liberal arts school in Hartford with about 2,200 students. Founded in 1823, it’s the second-oldest college in Connecticut after Yale.

The Associated Press contributed to this report.