Authorities say two men opened fire on a party where a pregnant woman revealed her child's gender, killing one person and wounding eight, including the expectant mother and three children.
Another woman died at the scene and four other adults, including some of the women's husbands, were also shot. "As of right now, I do not know what instigated this", Colerain's public information officer told WLWT.
Investigators eventually located nine victims.
WCPO reported that one woman was sitting in her vehicle when the shooting happened.More news: Iran, France stress political solution to Syrian crisis
The wounded victims were transported to the University of Cincinnati Medical Center and Cincinnati Children's Hospital Medical Center.
It was a typically "tranquil" summer Saturday in an OH neighborhood as people gathered at an afternoon gender-reveal party that stretched into the night in the Cincinnati area.
"You're hoping that there won't be situations like this", Love said.
Police were able to obtain an order from a judge to search and control the home, Love said.More news: Wimbledon 2017: Top seed Angelique Kerber lives to fight another day
Some of the victims are children, a Colerain Township police spokesman told WLWT News 5.
A bystander phoned 911, telling the dispatcher she'd seen a pair of men enter the house while sitting outside in her vehicle.
Although there is no one in custody, police said 911 calls and radio logs indicate that there may have been two shooters, WCPO reports.More news: Toronto Raptors re-sign forward Serge Ibaka to three-year deal