Firefighters have brought under control the fire in a building in London's Camden Market, the London Fire Brigade said on Monday.
The London Fire Brigade said on Twitter the "fire is now under control but crews will be damping down into the morning".
The first, second and third floors and the roof of the building were on fire, the brigade tweeted earlier, saying more than 70 firefighters and 10 fire engines were on the scene.
The cause of the fire was unknown and there were no immediate reports of any injuries or casualties.
London's Camden Market had an incident of fire in 2008 when market storage areas and shops in the locality were set ablaze and adjoining houses were damaged. A major part of the market had then remained closed for several months.
In June, at least 80 people died in a devastating fire in London's 24-storey Grenfell Tower.
Prime Minister Theresa May later said that 120 other high-rise buildings had failed fire tests.
Fire ravages building in London's Camden Lock Market
Seventy firefighters battled a large fire in a building in London's popular Camden Lock Market in the early hours of Monday, the London Fire Brigade said.
The emergency service said it had also sent 10 fire engines to the scene, near a nightclub and a covered market.
There were no reports of any casualties.
"The first, second and third floors, plus the roof, of a building within the market are alight," the London Fire Brigade said on Twitter.
"The Brigade's 999 Control Officers have taken multiple calls to the highly visible blaze and people are asked to avoid the area," it said on Facebook.
Images shared on social media showed tall flames and a burnt out building at the north London market, which is popular with Londoners and tourists.
"The fire was moving very fast," witness Joan Ribes, 24, told the Press Association.
He said the fire "was flying through the air to the surrounding areas".
"People were watching, but we were scared the building could explode at any time since there are restaurants with kitchens nearby," he said.
A London Ambulance Service spokeswoman said they were called to a fire at 00:07 am (2307 GMT on Sunday).
"We sent a clinical team leader and our Hazardous Area Response Team to the scene.
"We have not treated any patients, and we remain at the scene," she said.