Irving Parking Garage Collapses

The third level of a parking garage in Irving collapsed Tuesday hours after the second level came down. At least 21 vehicles were heavily damaged or destroyed.  Urban search and rescue teams, working with canine units, later confirmed that no one was trapped under the concrete and steel debris and there were no injuries. The Occupational Safety and Health Administration said it appeared to be a spontaneous collapse caused by volatile soil and swelling between seasons.