A hero Alaskan man prevented a Labor Day tragedy when he wrestled a loaded gun from an attacker who threatened to use it at a crowded fairground.

Jaden Perry, 24, was visiting the Alaska State Fair in Anchorage to help a friend take down a booth when a fight broke out between around eight young men.

The fight escalated when one of the men pulled out an extended magazine Glock in the middle of the fair, Perry told the Daily Mail.

He didn't hesitate, going for the gun and tackling one of the men while making sure the weapon remained pointed at the ground.

Perry's quick-thinking reaction was captured in video footage of the dramatic moment. In it, he can be seen unloading the clip and emptying the chamber while the offender still has hold of the gun.