Jerman said police haven't determined the motive for the shooting but investigators believe one of the victims was targeted.
"This is another mindless and senseless gun-related incident involving a reckless disregard for human life," Jerman said. "I remain livid and angered at the continued and blatant disregard and lack of respect for human life that continues. That said, I want to reassure the residents of this city that Cedar Rapids is a safe city."
The club's owner, Mod Williams, told the Cedar Rapids Gazette that he is working with police.
"It's an extremely disturbing thing that happened and currently I'm just being as cooperative as I can to help the police," Williams said.
Mayor Tiffany O'Donnell expressed dismay about the shooting and lauded the police response. She also urged residents to speak out against violence.
"Shock, anger, grief, disappointment — just a few of the emotions that I'm sure we all feel today," O'Donnell said. "And I can personally say that as a mother my heart goes out to those moms and dads today who are having the worst day of their lives. To the families of the injured, we are with you and we are praying for a swift recovery."