COPENHAGEN, Denmark (AP) — Firefighters in Copenhagen plan to start taking down scaffolding that is left dangling dangerously Friday outside the ruins of the Danish capital’s historic Old Stock Exchange building after a fire tore through it and collapsed much of its structure.

A large blaze broke out at the 400-year-old landmark on Tuesday, toppling its roof and iconic dragon-tail spire. On Thursday, a large section of the outer wall of the building collapsed inwards. The most valuable paintings and items inside had been saved from the flames, and no one was injured.

“Right now, structural engineers and engineers are assessing how it can be done to cut the scaffolding free,” said Tim Ole Simonsen, a spokesman for the Greater Copenhagen Fire Department. “It is very difficult work.”

He added there were still pockets of small fires and “tons” of debris inside the ruins of the building, which dates to 1615 He said they were also using a drone to survey the work.

Tuesday’s blaze was believed to have started on the roof of the building, which had been wrapped up in scaffolding while the building was being renovated. The cause remained unclear and police had yet to enter the burned part of the building to investigate.

The plans to remove the scaffolding was an attempt to salvage the unharmed part of the Copenhagen landmark. Firefighters said they could not say how long that would take, and adjacent streets were still closed for traffic.

The Danish Chamber of Commerce, which was headquartered at the building and owns it, has said it wants to r econstruct the building. However, no decision has yet been made about who will finance a reconstruction, a project that would cost millions, if not billions of kroner (dollars) and take years.

The exchange, known for its green copper roof and distinctive in the shape of four intertwined dragon tails, sits on the waterfront next to the Danish parliament. It is considered a leading example of the Dutch Renaissance architectural style in Denmark. The Chamber of Commerce moved into the building after Copenhagen’s stock exchange left in 1974.

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