A number of roads were cordoned off as firefighters battled a blaze at a livery hall in the City of London.
Emergency services rushed to the scene of fire, which broke in the basement of the four storey Wax Chandlers' Hall in Gresham Street, at about 4.30pm on Monday.
Around 50 people fled from the building before fire engines arrived.
A City Police spokesman said that road closures were put in place in Gresham Street, Staining Lane, King Edward Street.
A spokesman for the London Fire Brigade said: “Four fire engines and 21 firefighters and officers have been called to a fire in the basement of a Livery hall on Gresham Street in the City.
“The fire is affecting part of the four storey hall's basement.
“Around 50 people left the building before the Brigade arrived.
“The Brigade was called at 4.34pm. Crews from Dowgate, Soho, Shadwell and Dockhead fire stations are at the scene.
“The cause of the fire is unknown at this stage.”
Motorists have been warned to avoid the area.