There is also no indication that anyone helped the gunman in the shooting or how far in advance the incident was planned.
Biehl also updated the number of survivors who were treated for gunshot wounds. Previously, 14 people were listed as being shot. Three additional people have been treated for gunshot wounds, bringing the total to 17.
Dayton Mayor Nan Whaley said that she is working on forming a committee to create a permanent memorial for the victims.
She asked that everyone keep the victims' families in their hearts and to continue to support them as they mourn their loved ones.
More than a dozen agencies responded to the shooting, Dayton City Manager Shelley Dickstein said.
In addition to the Dayton Police Department, officials from 14 agencies, including from the federal state and county level, responded to the Oregon District that night.
Hundreds of first responders provided support through medical care, providing CPR and setting up tourniquets, Dickstein said.
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