Langdon Street was jammed with fire engines Monday morning, responding to a two-alarm fire at the UW-Madison Memorial Union, a fire that was under control in 17 minutes. The cause of the fire is unknown, but Madison Fire Department spokesman Eric Dahl told Madison.com it was mainly confined to the attic above the theater. The theater part of the union is being renovated, and all of the construction workers inside the building at the time were able to evacuate safely.