Andrew Pate reports on the blaze which has gutted part of a school in Dorset.
Fire experts believe the blaze at Lytchett Minster School was caused by a lightning strike. Nearby residents said they heard a thunder clap followed by lightning. The flames were spotted shortly after.
The whole of the roof of the arts block - which includes studios - has been destroyed.
This footage - captured by Liz Hannam - shows how the Lytchett Minster school blaze could be seen from miles around.
These are the pictures of the fire taking hold at the Lytchett Minster School, in Poole, Dorset.
Fire crews remain at the scene of the Lytchett Minster school blaze. The school was only recently fully reopened after a £12 million pound rebuild following a fire in 2000.
Staff and pupils had been working in temporary buildings after the original school building was ripped apart by the fire in 2000.
Fire officer Dave Arundel said he feared another rebuild will be necessary once the full impact of today's blaze is realised.
He said: "In my professional opinion, children and staff will not be able to return to this building.
"We are still working on it, so we don't know the full extent of the damage. We are waiting to see if any sections of the building have collapsed, but I don't believe it to be structurally sound."
Dave Arundel, Christchurch fire station commander, said: "This is probably the largest school fire of its kind we've had to deal with. There are dozens of firefighters on scene, and they will be here for some considerable time yet."
The fire is believed to have started in the school roof, and has since engulfed the whole of the first floor and part of the ground floor.
Mr Arundel said: "Firefighters initially tried to gain access to the building, but they realised the fire was above them and so they couldn't.
"The cause of the fire is as yet unknown, but we believe it started in the roof and has then spread quite quickly."
The fire in the arts and media block at a school in Dorset has burned through the roof and taken hold on the first floor.
Fire Liaison Dave Arundel from Dorset Fire and Rescue Service said: "The building will be lost."
Sixty firefighters are currently working on the scene, at Lytchett Minster School.
Ten fire appliances, three water carriers and two aerial ladder platforms have been sent to tackle the flames. The cause is being investigated.
Dorset Fire and Rescue Service said there was no one in the building and there are no reports of any injuries.