At Mile High Spirits an off-duty FBI agent was impressing a crowd with his killer dance moves at around 00:35.

At American Distillery bar in downtown Denver, US officer with dance moves and an improvised backflip until his handgun tumbled out of his waistband holster and a round went off as he picked it up, injuring another clubgoer.

But his backflip could have proved fatal.

The victim was hit in the lower leg and taken to a local hospital but is expected to be OK, according to Denver Police.

It is unclear if the agent, who has not been named, will face charges or disciplinary action.