Hospitals: 'No training on earth that will prepare you for this'

Once the news broke about the shooting, VanHouweling said he didn't have to ask for his staff to come in to help. About 300 staff members showed up on their own accord after they saw the news. Hospital staffers routinely deal with people with traumatic injuries, but when they arrived in large numbers after Sunday’s mass shooting on the Las Vegas Strip, even the most seasoned professionals could not be prepared for what they saw. “It was like a war zone,” said Mason VanHouweling, chief executive officer of University Medical Center.