Hamilton County Prosecutor Joe Deters said the rapid police response probably prevented many more casualties.
According to CNN reports, the three men killed were Luis Felipe Calderon (48) Pruthvi Raj Kandepi (25), and Richard Newcomer (64).
Radio traffic indicated other victims may have been transported to Good Samaritan Hospital. Two of those patients are among the dead, officials said, one is in serious condition and the other in critical condition.
Police said a gunman entered the building through a loading dock and made his way to the lobby of the office building.
He lived about 15 miles west of Cincinnati in the town of North Bend, Ohio, since at least 2015, Isaac said.
He was not a current or former employee at the center, whose primary tenant is the Fifth Third Bank headquarters.
His boss told officers in October 2014 that Santa Perez had been throwing tools and not acting right in the week before he was let go and that he "was afraid of what Omar might do", according to a police report.
Steve Conner lives on the first floor of the apartment building where the Santa Perez lived.
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According to Bloomberg, the DNC said it believed all of the defendants in the case had been served, with the exception of Mifsud. That account conflicts with what Sessions, now attorney general, testified before Congress. "We don't talk politics", he said.
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For his part, Rouhani demanded an immediate withdrawal by American forces in the country, which the other leaders agreed with. Putin said a ceasefire would be pointless as it would not involve Islamist militant groups it deems terrorists.
The footage also showed 29-year-old Omar Enrique Santa Perez walking quickly past a security turnstile Thursday morning just as he was shot by police officers who fired through a plate glass window.
No police officers were hurt. Call received at 9:10am. "I've spoken with the Mayor and informed him the state will provide any necessary resources to the local police", Kasich said.
Streets around the building at the city's Fountain Square were closed as were sidewalks. Yudy Martinez Perez broke down crying in the kitchen floor of her Forest Park, Ohio home Thursday afternoon when she learned that her nephew was the shooter.
The gray shirts haves a message in "police blue" that incorporates the Fountain Square's namesake fountain. It wasn't immediately clear if any knew the gunman.
Fifth Third, which operates 1,200 banking centers across several states, in a statement offered its "thoughts and prayers" for everyone "caught up in this awful event".
Witnesses in the area described a chaotic walk to work, hearing about 10 gunshots ring out during the morning rush.
The three people shot and killed in the lobby of a Cincinnati office building didn't have any apparent connection to the gunman.
Dozens of law enforcement officers and medics swarmed the scene. Federal Bureau of Investigation were also on the scene. These kinds of mass random things are similar to inner city violence that rip apart low-income communities, and both those and the ones we are seeing all across the country - in churches, in schools, in nightclubs - are so tragic.