Police closed a road as firefighters ran a hose from the canal to tackle the blaze.
"Fifteen fire engines, plus support vehicles, are now in attendance at the scene and crews are tackling a fire in one of the stages there".
A total of 18 fire crews, including two from Welwyn Garden City, have put out the blaze at the studios where all eight Harry Potter films were made.
Original story: 18 fire crews and around 75 fire fighters are now tackling a blaze at Warner Bros studios in Leavesden, after a fire broke out last night.
A spokeswoman later stated: "The hearth at Warner Bros Studios is now out however a number of automobiles stay on web site".
The council said the set was not being used at the time and there had been no injuries.
Warner Bros described the alleged attack as an "isolated workplace incident" in a statement issued at the time.
A earlier assertion learn: "The hearth and rescue service had been referred to as to studies of a hearth at Warner Bros Studios in Leavesden in Hertfordshire at 11.29pm on Wednesday 10 July".
A fire has broken out at Warner Bros studios, the famous filming location in which Harry Potter was filmed.
A couple of photos taken during the night show a huge plume of smoke over the studios. Warner Bros. said the tours were not affected and were going ahead as normal.
By 8.00 a.m. BST (2 a.m. ET) 15 fire crews were at the blaze, which was first reported at approximately 11.30 p.m. BST, officials stated.
"There was quite a strong smell of smoke in the air as well".
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