The shooter is believed to have targeted an area close to Ned Peppers Bar in the Oregon District, downtown Dayton on Sunday.
The gunman was shot dead by police and officers are now looking for a second possible shooter who left the area in a dark-coloured jeep, KDKA-TV reports.
Mayor of Dayton Nan Whaley said uniformed police arrived at the scene less than a minute after the gunman opened fire.
She said: ‘The shooter was able to kill nine people and injure 27 in less than a minute. ‘If we didn’t have police in the Oregon District, [I just want you to think of] the thousands of people enjoying their Saturday evenings, what could have happened [to them].
It’s a terrible day for Dayton, but I am so grateful for Dayton Police’s fast action.’
Bystander James Williams described seeing the shooter arrive with an ‘AR-15 rifle, wearing a vest and ear muffs’, and said he ‘just started blowing bullets everywhere’.
He said: ‘Sad people are not right. I’m safe. Happened right in front of the patio where I was sitting in front of Ned’s.
‘The guy in front of Ned Peppers’ door is the active shooter. He tried to go into the bar but did not make it through the door. Someone took the gun from him and he got shot and is dead.
The shooting comes just hours after at least 20 people were shot dead in a Walmart shopping centre, in El Paso, Texas.
A gunman opened fire and killed ‘multiple’ people doing their Saturday shopping at the Cielo Vista Mall, said Mayor Dee Margo.
It is believed around 40 others were injured in the attack, including a four-month-old baby, CBS News reports.
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