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At least 40 firefighters are battling a blaze in a flat above a shop on a busy high street.

Video and photos taken by witnesses show a room filled with flames as smoke billows into the air through an open window.

Six fire engines and dozens of firefighters were called in to battle the inferno in Camden High Street in north London.

The entire first floor flat was in flames.

There were more than two dozen calls to 999 at the height of the blaze, which broke out just before 1pm.

Did you witness the fire? Email webnews@mirror.co.uk.

(Image: John Burr/Camden Jonny)

It was not known if anyone was inside the building when the blaze broke out.

The cause of the fire is not known.

Witness John Burr said he noticed the blaze as the first fire crews arrived at the scene.

(Image: john burr)

He told Mirror Online: "All of the smoke was billowing out, the fire brigade had just pulled up, they got their hoses out and did their thing.

"It seemed to spread [into the next room]."

An ambulance crew was at the scene.

(Image: John Burr/Camden Jonny)

Mr Burr said builders have been doing work at the ground-floor shop and they removed its roof on Wednesday.

There was no indication that the blaze was linked to the work.

A London Fire Brigade spokesperson said: "Six fire engines and around 40 firefighters have been called to a fire at a flat above a shop in Camden High Street.

"All of a first floor flat is alight. The Brigade's 999 control officers have taken 26 calls to reports of the fire.

"The Brigade was called at 12.56pm.

"Fire crews from Euston, Kentish Town, Soho and Holloway fire stations are at the scene.

"The cause of the fire is not known at this stage."