Police refuse to rule out charging father and son who allegedly beat armed ...

Victoria Police have not yet said whether they will lay charges against a pair of Melbourne shopkeepers who fought back against a gunman who tried to rob them.

Police said they are still investigating the circumstances around the attempted robbery in Melbourne's northern suburb of Hadfield on Sunday night. 

Store owner Jackie Chen and his son Jason said they were lucky to be alive after a gunman's firearm allegedly went off as they fought to stop their store being robbed.

The moment they fought back against a group of robbers armed with a gun and what appears to be a taser was caught in terrifying camera footage.

Four armed thugs allegedly stormed the supermarket on North Street shortly before 9pm on Sunday, according to reports and video of the incident.

One of the men, allegedly armed with a gun, demanded money, but the shopkeepers refused. 

The man with the gun shouted 'Sit down, don’t move. You move, I kill you,' Jackie Chen told Nine News.

Immediately Mr Chen swung into action, striking the man several times with a large pole.

The North Street supermarket in Hadfield, Melbourne, where the attack occurred on Sunday

The North Street supermarket in Hadfield, Melbourne, where the attack occurred on Sunday

His son Jason, 30, joined the struggle to subdue the attacker when he saw him point a gun at his father's head.

The gun allegedly went off in the melee.

Jason told Nine News the bullet nearly hit him in the head.

'It was so close ... but we lucky he missed,' he said.

The Chens subdued the attacker as three accomplices fled in a vehicle.

Video footage of the citizens' arrest shows the man detained on the ground, where he remained until police arrived to arrest him.

As the alleged attacker cowered on the ground, video footage showed him being struck several times with a pole. 

One of the alleged attackers was struck several times as he cowered on the ground

One of the alleged attackers was struck several

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