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.Leticia Ramirez, a spokesperson for Saint Alphonsus Regional Medical Center in Boise, said emergency and trauma teams were working with first responders to treat patients who arrived from the scene.Authorities are investigating what caused the collapse. It happened next to Jackson Jet Center, which offers private airplane charters and maintenance.Boise city permitting records show the contractor Big D Builders had obtained permits to build a 39,000-square-foot (3,623-square-meter) jet hangar for Jackson Jet Center.The $6.2 million project was to include the construction of a concrete foundation and a metal building. Messages left by phone and email seeking comment from Big D Builders were not immediately returned.Jessica Flynn, CEO of Jackson Jet Center, said in a statement that their “hearts go out to everyone affected by this horrific event.”Flynn said the collapse happened just west of the existing Jackson Jet Center at a site where the company’s new hangar was under construction. She said dozens of people were working on the site.“We do not know exactly what caused the hangar collapse,” Flynn said. “Our focus now is on supporting our team and partners during this difficult time.”James Quintana was driving to the airport when he saw emergency vehicles rushing past him. He said he immediately thought it was a plane crash. He then saw the collapsed hangar and paramedics tending to victims.“I’m retired law enforcement and when there is that much commotion, that many emergency personnel and vehicles, there is something huge that has taken place,” he said. “It was a scary sight.”Cody McGowan was working about 100 yards (91 meters) from the building when he said he heard something that sounded like a loud dog whine. When he looked up, he saw a hangar as tall as 3 ½ to 4 stories tall collapsing in on itself and part of the crane on top.“When I walked up there, you’re just kind of like, ‘Wow,’” he said. “It’s shocking to see a building falling in on itself.”
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