Dramatic video has emerged showing hero police officers shooting and killing the Dayton gunman as he sprayed bullets into a crowd of terrified victims.

Masked Connor Betts' rampage lasted less than a minute but he managed to fatally shoot nine people, including his younger sister Megan using a modified .223-calibre automatic rifle.

In the video, screaming revellers crouch down and run for their lives along a pavement as 24-year-old Betts, wearing body armour and black clothing, fires dozens of shots from a gun equipped with a “double-drum” magazine that could hold 100 rounds.

As the crowd clears, Betts appears in the camera's view and is gunned down by police outside the doors of Ned Peppers Bar, stopping America's second gun massacre in just 13 hours.

Betts drops to the floor and tries to get back onto his feet.

A different camera shows officers, armed with their service weapons, running towards the active shooter and taking him out with a volley of shots.

Witness Anthony Reynolds told Reuters he heard gunfire that sounded like it was coming from a high-powered weapon.

He added: "Just boom, boom, boom, rapid.

"You could tell there's a big gun. You're not going to get those from no handgun. You're not."

The CCTV video was released by police after Betts killed nine and wounded at least 27 others.

The nine victims were five men and four women ranging in age from 22 to 57. Six were African-American.

Betts' 22-year-old sister Megan, the youngest of the nine victims, was among the first to be killed.

Betts had arrived with her earlier in the evening, but they separated before the rampage, according to police.

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