Who is shooting at Great American Tower?

For the fourth time in eight days, someone driving on Fort Washington Way aimed a gun in the direction of the Great American Tower and fired, breaking windows and a considerable amount of peace of mind.

Multiple units within the Cincinnati Police Department are working to find the suspect responsible for shooting the tallest building in the city, said police Cpt. Mike Neville.

"This is very disturbing to me," Neville said. "The safety of the people in the building is paramount to me. Anything short of that is unacceptable."

The incidents occurred on Jan. 19, Friday, Monday and Tuesday, all well after normal business hours when no one besides security personnel were in the building, Neville said. The shots hit both the Great American Tower and the building next to it – the 303 Broadway building – between the ninth and 11th floors. The shots caused damage to the windows, wall and blinds. One window remained boarded up Tuesday afternoon, while the other shattered windows were heavily taped.

On Tuesday morning, the department shut down the Lytle Tunnel to investigate the scene. Officers recovered spent ammunition casings, did trajectory analysis and submitted evidence to lab analysts.

Neville didn't want to reveal too much about how police are going about their investigation, but he said he would walk the public through the process once police apprehend the suspect.

"We have every bit of technology at our disposal," he said. "We have motivated, driven police work on top of it."

The department has not released the name of a suspect or any possible motive in the shootings.

Preliminary work indicates that the suspect was using a handgun. When asked why someone would use a weapon that probably isn't very accurate from a long distance, Cincinnati police Sgt. Mark Hunley said the suspect could have military background and be very accurate, or the suspect may not care about accuracy.

Employees walking into the Great American Tower Tuesday morning said they weren't too concerned about the shots.

Mike Laatsch, the vice president of public relations at Western and Southern Financial Group, the company that owns the building, said management is taking extra precautions to ensure the safety of employees.

Great American Insurance Group, Insight Global, Key Bank and Lafayette Life Insurance are some of the building's current tenants, according to the building's website.

Management has set up expanded access control to the building – employees now have to swipe a badge to get into the elevators and other locations – and more security personnel is present. Each company is making its own decision about whether employees should move desks away from the windows, Laatsch said.

Diane Weidner, the assistant vice president of investor relations at the Great American Insurance Group, said the safety of employees is the company's No. 1 priority right now. "We're hoping this comes to a conclusion very quickly," she said.

Great American Insurance Group closed its office from 6 p.m. Tuesday until 6 a.m. Wednesday for safety reasons. Weidner said there aren't a lot of employees who are in the building late at night, but the company wasn't taking chances.

Police have been in contact with representatives from the building about security measures, but Neville said the police department won't be imposing any restrictions on employees.

"We, as a police department, are doing everything we can to assist in finding this person. The safety of the people in the building is my utmost concern. I will not sleep until the person is found."

Keith BieryGolick contributed to this report.