Copenhagen residents watch in shock as a huge fire engulfs Copenhagen's 17th century former stock exchange, one of the oldest in the Danish capital. "This is our Notre-Dame! This is our national treasure," says one resident. "I've been in there several times and it's a magnificent building. So it makes me feel very very emotional." The building was undergoing renovation work when it caught fire, which toppled the historic building's landmark spire, and whose cause was yet unknown. IMAGES AND SOUNDBITES