ARMED cops stormed a swingers ball and shot two people having sex while dressed as the Joker and Harley Quinn.

The Melbourne nightclub Inflation was hosting the fancy dress "no holds barred extravaganza of adult fun" event when police burst in - as the pair had sex in front of partygoers.

4 The man dressed as the Joker is rushed to hospital after being shot in the torso Credit: 9News

4 The woman dressed as Harley Quinn is wheeled into an ambulance looking visibly distressed Credit: 9News

The Saints and Sinners Ball ended in panic this morning as the man and woman were shot by officers in an incident believed to have been sparked by a fake gun.

The 35-year-old man dressed as the Joker was shot in the torso after authorities said he pulled out a weapon, the woman dressed as Harley Quinn was shot in the leg.

However club owner Martha Tsamis said "the male victim was not holding anything in his hand but rather he was in a compromising position with his female partner, which a normal activity with the nature of this event".

The pair were rushed to hospital with the man said to be under police guard and in a critical condition.

Cops arrived at the club where the swingers party was in full swing in response to reports of a man armed with a gun.

He is alleged to have pulled it from his trousers and pointed it at the approaching officers, refusing to drop it when asked.

4 The 35-year-old man dressed as the Joker was shot in the torso after authorities said he pulled out a weapon Credit: 9News

4 The man is alleged to have pulled a weapon from his trousers and pointed it at the approaching officers, refusing to drop it when asked Credit: 9News

Superintendent Lisa Hardeman said this morning: "As a response police then fired a number of shots and a male and female were injured.

Adding: "When a firearm is pointed at you in these circumstances, police are not sure at that stage whether it is real or an imitation.

"That will be part of the investigation."

In a statement on Facebook owner Martha Tsamis said the events had been running successfully for the last 20 years.

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"These events have been held for approximately 20 years at Inflation without any incident.

"Participants are generally older adults who come in costume and engage with each other in adult fantasies.

"The outfits and accessories are always shown to security as a condition of entry."

The "rockers, punks and goths" themed ball was aimed at "broadminded adults" and tickets sold for $55 per person.

It has been described as "Australia's raunchiest party" and is held four times a year.

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