A fire ravaged Copenhagen's historic Old Stock Exchange on Tuesday, causing the collapse of its iconic 17th-century spire. Passersby rushed to assist emergency services in saving priceless paintings and other valuables from the flames.

Danish Culture Minister Jakob Engel-Schmidt praised the community's response, describing it as "touching" to see so many people assisting in saving the building's art treasures and iconic images. One man even abandoned his bicycle on his way to work to join the efforts.

Brian Mikkelsen, chief of the Danish Chamber of Commerce housed in the Old Stock Exchange, and his staff were seen carefully selecting paintings to rescue. These artworks were later transported to safety at the nearby parliament and Danish National Archives, located just around the corner from the burning building.

"We have been able to rescue a lot," a visibly moved Mikkelsen told reporters. "It is a national disaster."

He also took part in saving paintings and other valuables from the flames and said they had to use tools like a crowbar to remove them.

The fire began Tuesday morning in the copper roof of the Old Stock Exchange, or Boersen, spread to much of the building and the roof, parts of which also collapsed and destroyed the building's interior, said firefighters spokesman Jakob Vedsted Andersen.

"The fire is still not under control," Vedsted Andersen said, adding that half the building was destroyed and collapsed. He said there was no risk of the blaze spreading to other buildings. Firefighters said they expect to be at the scene for the next 24 hours.

Tommy Laursen of the Copenhagen police said it was too early to say what caused the fire and that they would be able to enter the building in "a few days."

Firefighters who reportedly pumped water from the nearby canal were seen spraying water through the doorway of the Old Stock Exchange's gilded hall, which is used for gala dinners, conferences, parties and other events and where many of the paintings hang.

The building, situated next to Christiansborg Palace, where the parliament sits, is a popular tourist attraction and has been photographed millions of times. Its distinctive spire, in the shape of the tails of four dragons, twined together and reached a height of 56 meters (184 feet).

Huge billows of smoke rose over downtown Copenhagen, and people were seen rushing inside the building to save paintings. The plume could be seen from southern Sweden, which is separated by a narrow waterway.

Ambulances were at the scene, but there were no reports of casualties. A spokesperson for the company working on renovating the building said the carpenters who worked on the roof had all come out.

Up to 90 members of an army unit were also deployed from a nearby base to cordon off the area and "secure valuables," Denmark's armed forces said.

King Frederik wrote on Instagram that "they woke up to a sad sight" of "an important part of our architectural heritage" being destroyed by the flames.

Prime Minister Mette Frederiksen wrote that "irreplaceable cultural heritage" and "a piece of Danish history is on fire."

"It hurts to see," Frederiksen wrote on Instagram.

The building and the spire had been encased in scaffolding, which later collapsed in the fire. The roof, masonry, sandstone, and spire of Boersen – built in 1615 and considered a leading example of Dutch Renaissance style in Denmark – was being renovated, said the Chamber of Commerce, which moved into the building after Copenhagen's stock exchange left in 1974. The chamber owns the building.

The adjacent Christiansborg Palace has burned down on several occasions, and most recently, in 1990, a fire broke out in an annex of the Danish parliament known as Proviantgaarden. However, the Old Stock Exchange survived unscathed.

That annex, which lies in the block behind the Old Stock Exchange, was evacuated as a precaution, as were different ministries in the street behind the burning building.

Police said on the social media platform X that a main road in Copenhagen was closed and people should expect the area to be cordoned off for some time. Several bus lines were rerouted and Danish media reported huge traffic jams in the surrounding area.

Queen Margrethe, who turned 84 Tuesday, toned down the celebrations because of the fire, broadcaster TV2 said. A band with the Royal Life Guard was to play for the former monarch outside the Fredensborg Castle, where she was staying for the spring and summer, but that had been canceled.