November 13, 2017 12:10 am Gym Stairway Collapse Injures at Least 23 Most of those hurt were children. NBC 7’s Mackenzie Maynard reports. US & World Videos 2:45 La Jolla Concours d'Elegance classic race cars 1:39 Troops Endure Hyper-Realistic Training 2:07 New study links consuming red meat with dementia 2:05 Police find, return dozens of abandoned Amazon packages 0:28 A Vermont state trooper plunges into icy pond to rescue 8-year-old girl
