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Gardai are investigating a picture posted on social media by UFC star Conor McGregor.

The Dubliner took to Instagram to upload an image of himself leaning out the window of a high-powered car while holding what looks like an imitation firearm.

The snap was posted with the caption: "Put the fight game in the bag and step away from the vehicle."

A Garda spokeswoman told the Irish Mirror: "Gardai in Crumlin are investigating the circumstances surrounding the picture."

It was taken as McGregor enjoyed some downtime with his family after claiming the UFC World Featherweight title last month.

The 27-year-old blitzed Brazilian Jose Aldo in 13-seconds and made UFC history in the process.

Earlier today, UFC boss Dana White confirmed he would allow McGregor the opportunity to hold both featherweight and lightweight gold.

The UFC president said: " Conor has said that he would like to win the 155-pound belt and fight four times a year and defend both belts.

"If anybody can do it, Conor McGregor can. This guy has pretty done everything he said he would do. I'm interested."

White then further continued: "Normally I would say if you're going to move up in weight, you have to give up the belt.

"But Conor has done everything he said he would do. He loves to fight. He really likes money, so if anybody could do it, it's probably him."