A BEAUTY salon run by druglord Mark Richardson’s partner has been firebombed — amid increasing tensions between caged mobsters.

Video footage shows a hooded thug targeting the Belle Cheveux parlour in Leith, Edinburgh.

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The figure, clad in black, is seen walking up to the premises before launching a flaming missile through the window, causing shattered glass to explode around his feet.

He points mockingly at his handiwork then turns towards the camera as the inside of the building erupts in flames.

Cops are probing the arson attack in the early hours of last Thursday.

The fire forced residents to flee the tenement building.

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Days earlier Richardson, 37, had been transferred from Glenochil jail, near Alloa, to Low Moss nick in Bishopbriggs, near Glasgow, amid claims of an escalating gang war.

Sources say the move was aimed at keeping the Daniel gang associate away from bitter rivals linked to the notorious Lyons mob.

A source said: “There is an ongoing battle within prisons between factions linked to Richardson and others with Lyons connections.

"Richardson is a feared guy, so whoever is behind the attack on the parlour will have to be looking over their shoulder.”

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Richardson, of the capital, was jailed in 2018 for more than ten years for his role in a crime network said to be “the most sophisticated encountered” by Scots cops.

It followed a ten-year term in 2010 after he was snared in a £2million drugs sting.

A Police Scotland spokesman said: “We were called at around 2.30am on March 6 to a fire at a premises on Albert Street, Edinburgh.

“It was put out by the Scottish Fire and Rescue Service.

"No one was injured but adjacent properties were evacuated as a precaution.

"The fire is being treated as wilful.”

The Scottish Prison Service said: “We don’t comment on individuals.”

A Scottish Fire and Rescue Service spokesperson added: "We were alerted at 02.30am on Thursday, 6 March to reports of a fire within a ground floor premises in Edinburgh.

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"Operations Control mobilised four appliances to the city's Albert Street, where firefighters extinguished the fire and worked to make the area safe.

"There were no casualties."