, Jae Williams said he was at a nearby rap performance when they were told to evacuate.
"I was very shocked," he said. "We all evacuated quickly and safely. We were told to avoid the Oregon district."
"I got to my car, I could see cops, multiple ambulances. When I drove past I saw a lot of cops and ambulances."
Nikita Papillon, 23, was across the street at Newcom's Tavern when the shooting started.
She said she saw a girl she had talked to earlier lying outside Ned Peppers Bar.
Papillon said: "She had told me she liked my outfit and thought I was cute, and I told her I liked her outfit and I thought she was cute.
"People my age, we don't think something like this is going to happen. And when it happens, words can't describe it."
She herself had been to Ned Peppers the night before, describing it as the kind of place "where you don't have to worry about someone shooting up the place."
Tianycia Leonard, 28, was in the back, smoking, at Newcom's.
She heard "loud thumps" that she initially thought was someone pounding on a dumpster.
She said: "It was so noisy, but then you could tell it was gunshots and there was a lot of rounds."
The Ned Peppers is described on its website as a “traditional western-ish themed bar". Cops said the Oregon district was a popular and usually very safe section of the city.
People embrace and hold the Holy Bible as crowds gather for a prayer vigil in downtown Dayton Credit: EPA People console each other as they gather for a vigil in Dayton, Ohio Credit: Getty Images - Getty Crowds gather for a prayer vigil in downtown Dayton Credit: EPA Mourners gather at a vigil in Dayton less than 24 hours after a mass shooting in Oregon district of the town Credit: AP:Associated Press 'DON'T NORMALISE THIS' President Donald Trump paid tribute to the victims of two shootings, tweeting: "God bless the people of El Paso Texas.
"God bless the people of Dayton, Ohio."
Singer Lizzo has said it was a "close call" for her family, who lives in the Western Ohio city.
She tweeted: "Just got off the phone w/ fam in Dayton... it was a close call for them but that's not the case for 9 other families between this & the terrorist attack in El Paso & recent other shootings.
"I feel completely helpless.. make noise & bring awareness.. vote.. don't normalize this."
On Saturday, the attack near the Cielo Vista Mall left 20 dead and dozens more injured.
The second mass shooting in 24 hours is likely to further spark debate around America's controversial gun laws.
The vast majority of US citizens are allowed to buy and keep firearms without restriction.
Thirty-one states - including Ohio - allow "open carry", the open carrying of a handgun without any licence or permit, although in some cases the gun must be unloaded.
Ohio moderately strengthened its gun laws in 2018 by expanding domestic violence protection orders to include dating partners.
But according to campaign group , the state still lacks a number of basic gun safety laws.
Ohio Senator Sherrod Brown's statement on the Dayton shooting
"As Ohio wakes up this morning to the news of this horrific attack, [my wife] Connie and I are filled with sadness for the victims and their families and gratitude for the police officers who responded to the scene and the medical professionals caring for the injured.
"We are also angry - angry that shooting after shooting, politicians in Washington and Columbus refuse to pass sensible gun-safety laws to protect our communities.
"We are still learning about the attack in Dayton and we don't know exactly what, if anything, could have prevented this specific tragedy.
"But we know thoughts and prayers are not enough, we have a responsility to act."
Footage appears to show emergency vehicles outside a nightclub in Dayton, Ohio Credit: Dougie Doug Officials investigate the scene after a mass shooting in Dayton, Ohio, US August 4 Credit: Reuters Residents comfort each other as they await word on whether they know any victims of the mass shooting Credit: AP:Associated Press Cops are investigating an 'active shooting incident' in Dayton, Ohio Credit: Google Maps We pay for your stories! Do you have a story for The Sun Online news team? Email us at tips@the-sun.co.uk or call 0207 782 4368 . You can WhatsApp us on 07810 791 502. We pay for videos too. Click here to upload yours.