A 20-year-old has been shot dead allegedly taking part in a "prank" robbery being filmed for YouTube.

Witnesses told police Timothy Wilks and a friend had approached a group of people outside a family trampoline park in Nashville, holding large knives.

Mr Wilks was then shot by a 23-year-old, who told police he had had no idea it had been a "prank" and had been acting in self-defence.

Mr Wilks's friend told officers the "prank" had been for a YouTube video.

No-one has been arrested over the death.

Several families had been inside the Urban Air trampoline and adventure park, which describes itself as "kid friendly" and "family fun", at the time of the shooting, 21:20, local news outlet WKRN reported.

Robbery "prank videos" are relatively common on YouTube, sometimes involving fake firearms, balaclavas or getaway vehicles.