Explosions were heard and plumes of smoke billowed over Enfield after a blaze started in a workshop.
Firefighters raced to the scene of the fire in Windmill Hill just after 2pm on Thursday afternoon.
Nearby residents said they heard loud explosions which shook their houses, while they also described an acrid smell filling the air.
Neil Chandler told the Standard: “I was sat working in my home office when I heard a loud bang, and the windows rattled.
“I looked outside and a large plume of black smoke was rising from behind the houses opposite.
“After the first bang, there were two smaller explosions, just before the fire brigade arrived.
“We went around the house closing windows as there was an acrid smell to the smoke, like burning rubber.”
A spokesman for the London Fire Brigade said: “Four fire engines and around 20 firefighters and officers were called to a fire in Windmill Hill in Enfield.
"A single storey storage shed to the rear of a property was damaged by fire.
"The Brigade was called at 2.15pm and the fire was under control at 3.28pm. Fire crews from Enfield and Edmonton fire stations attended the scene.
"The cause of the fire is under investigation."