The old Stock Exchange building in central Copenhagen – one of the city's oldest structures, known for its elaborate spire of intertwined dragon tails – partially collapsed in a major fire late Tuesday.No one was injured, according to a statement from King FrederickIt was not immediately clear what started the fire at the structure, which appeared to be under renovation. As of early Tuesday afternoon the fire was still burning with "pockets of fire" in the building, a Copenhagen fire official said.The king said the building's famous spire had helped define Copenhagen as a "city of towers."“To this day, we have regarded the historic building as a beautiful symbol of our capital and a building of which we, as a nation, have been proud,” he said.Authorities responded to the fire shor...