No one was injured in the blaze, which also spread to nearby building, including a campus nightclub, Scottish Fire and Rescue Service said.
The Glasgow School of Art in Scotland was gutted by a fire that ripped through its historic Mackintosh building during the night of Friday, June 15. The area was swiftly evacuated and no casualties were reported.
About 50 firefighters were still tackling Friday's blaze with nine fire engines and four-high reach appliances at the scene.
Many deplored what they called the cruel irony of the fire coming hours after a giant mural depicting Charles Rennie Mackintosh was unveiled elsewhere in Glasgow.
Glasgow labels Numbers - who have hosted parties at Glasgow School of Art - and LuckyMe tweeted their support following the blaze. The restored building would have included a new fire-safety system. "We don't know yet what the structural condition of the building is". "Looking at it, it's a building that is just a shell".
Mackintosh's building, which was so unpopular upon construction that its designer wasn't invited to the opening ceremony, became a symbol of the innovative and distinctive Glasgow Style-an worldwide icon of art nouveau architecture.
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"This is clearly an extremely complex and large-scale incident, and one that is ongoing.
So relieved that there has been no loss of life", wrote Scottish First Minister Nicola Sturgeon on Twitter.
The 22-year-old chef from Glasgow said: "We've got just to the top of Renfrew Street and police closed off the road".
"I would like to thank the emergency services for their continued efforts. It is significantly damaged", Heath said. Alan Dunlop, the school's professor of architecture, said: "I can't see any restoration possible for the building itself".
No-one was hurt and an investigation into the cause is continuing.
A full-scale model of part of the library was later built to test if the original materials and techniques from Mackintosh's 19th century design could be used in its reconstruction. "All that seems to remain is the stone walls on the outside", he said.