A second-story apartment floor collapsed late Saturday night during a party, sending people tumbling to the first floor. It happened at 135 South 6th St. in downtown La Crosse. Three people were hospitalized after the floor collapsed right under their feet. According to the building’s owner, Nate Brooks of River City Rentals, the apartment’s tenants said those three people have been released from the hospital. Brooks also said, when he got to the scene, he found multiple beer kegs where the floor had collapsed. Sixth Street resident Larry Klahn heard loud music a few buildings down the block Saturday night, but didn’t think much of it. He was used to a lot of noise.