A blaze broke out at Warner Bros studios where the Harry Potter and James Bond franchises have been filmed.
Firefighters were scrambled to the studios in Leavesden, Hertfordshire, at 11.29pm on Wednesday.
Hertfordshire Fire and Rescue Service (HFRS) said 18 fire engines and crews were tackling the fire on Thursday.
In an update shortly before 3pm, Hertfordshire County Council said that the fire had been extinguished.
No injuries were reported and the council said the set was not being used at the time.
All eight Harry Potter films, as well as movies including James Bond, Fast and Furious and the Mission Impossible franchises, were filmed at the studios.
A spokesman for HFRS earlier told the Standard: "Eighteen fire engines and support vehicles are currently at the scene as crews continue to tackle the fire.
"Three jets and one aerial ladder platform are in use."
Road closures were place locally to assist firefighters in running a hose from the canal to help tackle the fire, police said on Thursday.
Herts Police said in a statement on Twitter at around 11.30am: "Police are closing Bridge Road in Leavesden at the junction of Watford Road, known locally as Hunton Bridge to assist HFRS and firefighters."
Warner Bros has not yet commented on the fire other than to confirm it was ongoing, the BBC reported.
A spokesman said the public studio tours were unaffected and taking place as usual.
Local Resident Mark Hancock, who lives around 200m away from the perimeter fence, told the BBC: “"The smoke went high into the air, and as I watched, the smoke appeared to get thicker, so much so that we could see the flashing lights of the fire engines reflecting off the thick smoke.
"It was still going strong at about 1am and when I woke up this morning it was still smouldering."
He added there was a "strong smell and taste of smoke in the air".
The 80-hectare complex is one of the only places in the UK where large-scale film productions can be made.
Following a refurbishment by Warner Bros of more than £110m million, the studios are now one of the largest and most state-of-the-art secure film-making facilities in the world.
The site – a converted World War Two aircraft factory – is home to stages, office spaces and one of the largest stage-based water tanks in Europe.
Since 1994, when the makers of James Bond film Golden Eye decided to transform the unoccupied aircraft hangers into a working studio, a succession of major movies were filmed on the site, including Star Wars prequel The Phanton Menace, Tim Burton's Sleepy Hollow and, most famously, the Harry Potter films
Warner Bros took full ownership of the Leavesden studios in 2010, making it the only Hollywood film studio with a permanent base in the United Kingdom.
As part of its extensive redevelopment work, Warner Bros created two entirely new sound-stages to house a permanent public exhibition called the Warner Bros. Studio Tour London – The Making of Harry Potter.
The attraction, which opened on 31 March 2012, now receives around 6,000 visitors a day during peak times.
Although one firefighter reportedly described Wednesday's fire as "significant", BBC reporter Alex Pope, who was at the scene on Thursday morning, said: "From where I am, it just seems like the studio is going about its day-to-day business."
