This is the moment a businessman guns down two alleged robbers during a failed stick-up outside a supermarket, leaving one dead and the other wounded.

The wild west-style shootout erupted in Villa Santos, an upmarket neighbourhood in the city of Barranquilla, Colombia, at around 5:35pm on Friday, 23rd May.

Security footage shows the two men arrive on a motorcycle and pull up beside a parked car as the shopper loads groceries into the boot.

One of the suspects climbed off the bike and approached the man to demand valuables.

He then backed off but the man had already moved to tackle the threat, and pulled out a pistol where he took cover behind his car and opened fire.

The ambushed men tried to flee on their motorcycle but only made it a few metres before collapsing in the street.

Cops raced to the scene and tool both suspects to Portoazul Auna Clinic.

One died shortly after arrival.

His identity has not yet been released.

The survivor, Julio Antonio Flores Mejia, 48, was shot in both legs and his right shoulder.

Police say he has previous convictions for homicide, extortion and illegal weapons possession.

A firearm and the bike used in the attempted robbery were seized at the scene.

Authorities say the victim drove off and have yet to confirm his identity.

They are investigating whether he acted in self-defence.

(MJ Leidig/newsX)