Dayton police said on Twitter that the shooter was among the 10 killed.
Dayton police patrolling the area responded in less than a minute to the shooting, which unfolded around 1 a.m. Sunday on the streets of the Oregon District, Dayton Mayor Nan Whaley said at a press conference. Dayton Police say the suspect also is dead.
"We had one shooter that we are aware of and multiple victims", he told reporters. We are working to identify him to see what his motivation was. Both the Federal Bureau of Investigation and Dayton Police are on scene and trying to find answers.
'As many as' 10 killed in reported mass shooting in Ohio
Mayor Nan Whaley says Betts was wearing body armour and had additional high-capacity magazines. Carper said OR was "a very safe part of downtown" Dayton and very popular with visitors.
Dayton Police previously said via Twitter that were "investigating an active shooter incident" in the city's OR district and asked residents to avoid the area. Footage and images from the scene show emergency vehicles outside the bar, which is the Dayton's arts and entertainment district.
"All of our staff is safe and our hearts go out to everyone involved as we gather information", the bar said ina post on Instagram. Asst police chief Carper added it was a "very short time line of violence" and that he was not aware of any remaining threat to the public.
Witnesses said they saw an unspecified number of "walking wounded" in the area, according to local media reports.
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A Facebook post suggested a person had taken "the gun from (the shooter)", who is now dead. The injured have been taken to several hospitals in the city.
More than two dozen people were injured in the attack at a busy shopping centre.
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