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(Image: TWITTER)

Cops were dispatched to the Doubles bar and nightclub in Hamilton, Ohio, US, to reports of an active shooter.

The situation is developing but there is already one confirmed death and multiple injuries.

Local media report the shooter is still active – it comes just days after a teenager went on a killing spree in Munich.

Inside the club is reportedly littered with used bullets and there are unconfirmed reports of multiple shooters.

Police Chief Craig Bucheit said detectives are still trying to determine the number of victims.

Officers are unsure of number of shooters and the motive.He said: “What happened tonight is unacceptable and we’re going to work with management and ownership to make sure it doesn’t happen again."

Witness Tolu Adeseha said he was inside the bar when he heard at least 15 shots go on for what "felt like hours" and said he saw multiple people with guns.

Some of the victims are believed to have "taken themselves to hospital", according to police.

(Image: TWITTER)

Tolu said: "It reminded me of things in the news, about people shooting and active shooters. This was a reality for me, what do you do in an active situation.

“You had people trying to play dead and things like that. This is an active shooter and I was trying to tell a girl next to me, you can’t cry, I know it’s traumatic for you, but you got to stay silent or play dead.”

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The shooting comes just weeks after an ISIS inspired guman slaughtered revellers at the Pulse nightclub in Orlando, Florida.

America is also on high alert following a spate of deadly police shootings.

The scene remains cordoned off by police while they investigate.