(CNN) - As a crowded group of Clemson University students and local residents danced and jumped around at an apartment clubhouse late Saturday night, Jeremy Tester felt something strange beneath his feet.
"You could hear the floor about to go through, kind of," he said, "but nobody thought it was going to happen. They just kept going."
Suddenly, the floor gave way. Dozens of partiers dropped into free fall and landed in a mass of sprawling bodies in the basement.
Police said 30 people were injured when the floor of the apartment clubhouse collapsed during a party during homecoming weekend in Clemson, South Carolina.
No individuals were trapped during the collapse and no one suffered life-threatening injuries, Clemson Police Chief Jimmy Dixon told CNN affiliate WYFF. A total of 30 people were sent to three area hospitals with broken bones and lacerations.
"We're just thankful that it was not any worse than it was," Dixon said.
Kappa Alpha Psi fraternity party
Clemson University said the event was an annual homecoming weekend party sponsored by Kappa Alpha Psi fraternity and attended by students and non students alike. In a statement Sunday, the university said it was working to identify Clemson students involved and to notify any other institutions whose students attended.
"The University will continue to do everything it can to help and support our students who were affected by this terrible situation, as well as their families and friends," campus President Jim Clements said in the statement.
Provost Bob Jones said the university's faculty had been asked "to exercise some flexibility in attendance policies for those students who were involved in this traumatic event."
Chaos and screaming
Tester said emergency responders were there in just minutes, and he saw people holding their arms or with bloody legs.
Video from the scene shows the floor opening up like in a horror movie. The scene of joy and celebration quickly turned to chaos and screaming.
Franzie Pendergrass and Leroy Pearson told WYFF they were in the middle of the clubhouse during the party. Pearson said he was jumping with his hands in the air when he suddenly felt a falling sensation, then blacked out.
When he came to, he saw "girls everywhere with blood all over their face and everything like that," Pearson said.
Pendergrass left with injuries.
"I got five stitches on my leg from a slash, a real bad cut after people grabbed me and jumped over the ones in there," he said.
Floor moved like trampoline
Jaylen Adams said he felt the floor going up and down like a trampoline as people jumped around to the music. He told his friends they needed to go on the balcony but the floor cracked before they could get out of the way. Adams didn't fall.
"They weren't hurt at all but other people were crying, bleeding, it was just a shocking moment for everyone," he said. "They then evacuated everyone and ambulances and a helicopter came for all of the injured individuals."
The incident occurred just after midnight Saturday at the clubhouse of the Woodlands of Clemson apartment complex, Woodlands Property Management President Tal Slann said.
The complex is about three miles northeast of Clemson University. The clubhouse building where the collapse happened is a common area within the complex and was built in 2004, Slann said.
Police said the investigation is ongoing.
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