More than 70 firefighters have been battling a fire at London’s Camden Lock Market.
London Fire Brigade said 10 fire engines were sent to the scene just before midnight on Sunday.
Pictures on social media showing a significant fire and some witnesses said they could see smoke from miles away.
The roof and three floors of the market building were alight on Monday morning.
Witness Joan Ribes, 24, said: “We called the police to close the street to the traffic because it was very dangerous, the fire was flying through the air to the surrounding areas.
“The fire was moving very fast. People were watching, but we were scared the building could explode at any time since there are restaurants with kitchens nearby.”
Another witness tweeted: “Just drove past Camden market and there’s a huge fire on top a building, close to the Lock Bridge! Crazy crazy scenes.”
Other emergency services were also called to the fire, with London Ambulance Service saying that it had not treated any patients.
Firefighters had the blaze under control by about 3.20am on Monday, but they will remain at the scene during the morning for “damping down”.
Investigations are underway to find out what caused the fire.
A different part of the market was damaged by a major fire in 2008, shutting the attraction for several months.
There were no reports of anyone being injured in the fire.