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One Day. Two Mass Shootings. 30 Dead.

10 people, including a gunman, are dead following an active shooter situation in Ohio, that took place just hours after another mass shooting in Texas.

The Dayton Police Department said nine people had been killed in the shooting which began in the Oregon District at 1:00 am local time.

Authorities work the scene of a mass shooting in Dayton, Ohio. PHOTO: AP Photo/John Minchillo.

Authorities said at least 26 others were injured, some seriously, in the attack which took place outside a popular bar in the city's nightlife district.

The shooter has not yet been named, but authorities have confirmed he was wearing body armour, had high capacity magazines and had extra magazines with him when he opened fire.

At a press conference on Sunday morning local time, Dayton officials said police who had already been patrolling the area, responded to the scene and took down the shooter in less than a minute.

Dayton Mayor Nan Whaley said if the police had not responded so quickly, "hundreds of people in the Oregon District could be dead today."

Whaley said she was "heartbroken" and asked the community to support each other.

Dayton Mayor Nan Whaley speaks during a news conference regarding the mass shooting. Photo: AP Photo/John Minchillo

"This is a day that we all dread happening and certainly what's very sad is that I've gotten messages from cities across the country... so many of us have gone through it," Whaley said at a press conference.

"Today is the 250th mass shooting in America, it's sad that it's in the city of Dayton."

Ohio's governor Mike DeWine described the shooting as a "horrible attack" and commended first responders for their bravery.

"I have ordered that flags in Ohio remain at half mast in honor and memory of the victims who lost their lives this morning," DeWine said on Twitter.

Authorities confirmed the FBI would also be providing assistance as investigations into the shooting begin.

Neither the gunman nor any victims have yet been identified and police are still unaware of the shooter's motive.

The attack came just hours after a mass shooting in El Paso, Texas left dozens injured and at least 20 dead when a gunman opened fire inside a busy supermarket.

READ MORE: At Least 20 Dead, Dozens Injured In Supermarket Mass Shooting

As many as 3,000 people were inside the store during the busy back-to-school shopping season.

The suspected gunman has since been identified as 21-year-old Patrick Crusius.

Photo: Twitter/ Anna Giaritelli.

A document, described by authorities as the suspected shooter's 'manifesto, is believed to contain references to the Christchurch mosques terror attack.

It's believed the suspect denounces Hispanic people in Texas, cites concerns about losing American jobs to automation and criticises both political parties, CBS reported.

No victims have yet been formally identified in the El Paso shooting.

It was the eighth deadliest U.S. mass shooting in the nation's modern history.

Featured Image: AAP

Contact the author: vgerova@networkten.com.au