 A hangar under construction on the grounds of the airport in Boise, Idaho, collapsed, killing three people and injuring another nine. Officials said .5 of those injured in the collapse at the Boise airport are in critical condition. The city said in a statement, authorities responded to a private business located at the Boise airport for a steel-framed hangar that collapsed. Boise Fire Department Operations Chief Aaron Hummel said during a news briefing, it was a very chaotic scene. Hummel said, describing the incident as a large-scale collapse of the framework of the building. I don't know what caused it, but I can tell you it was a pretty global collapse," he said, calling it catastrophic. Hummel said some of the victims were on a hoist or other elevated platform at the time the structure fell, and that required some specialized rescue efforts. He confirmed that a crane also collapsed in the incident. Letitia Ramirez, a spokesperson for St. Alphonsus Regional Medical Center in Boise, said emergency and trauma teams were working with first responders to treat patients who are right from the scene.