LONDON — A large fire ripped through the Glasgow School of Art in Scotland overnight Friday, officials said Saturday morning, causing extensive damage to a building considered the jewel in the city’s architectural crown.

It was the second time in four years that a blaze has hit the world-famous building, which was under restoration and was set to reopen after a fire badly damaged it in May 2014.

The building, widely described as a masterpiece of the Glasgow-born architect Charles Rennie Mackintosh, was completed in 1909.

Peter Heath of the Scottish Fire and Rescue Service told reporters that the call had come in at 11:19 p.m. Friday, sending more than 120 firefighters and 20 fire engines to the site.