- No casualties were reported in the fire, said London Fire Brigade
- Ten fire engines and about 70 firefighters fought the fire on the scene
- Three floors and the roof of a building in Camden Market were damaged
"The Brigade's 999 Control Officers took 37 emergency calls to the fire which was highly visible across the area during its early stages," it said on Facebook.
The first, second and third floors, plus the roof, of a building within the market, that had different businesses, were damaged by the blaze.
Camden Lock Market, that has more than 1,000 shops and stalls, is popular with Londoners and tourists alike.
"The fire was moving very fast," witness Joan Ribes, 24, told British news agency, Press Association.
He said the fire "was flying through the air to the surrounding areas".
The Metropolitan Police said officers were in attendance at the scene but did not immediately have any other information.
(With inputs from AFP and IANS)