A 2016 bus crash near Laredo, Texas that killed nine people was caused by the driver’s fatigue and diabetes complications, according to an investigation by the National Transportation Safety Board (NTSB). The May 14 incident occurred at approximately 11:24 a.m., central daylight time, when a 49-passenger motorcoach, operated by OGA Charters LLC of San Juan, Texas, entered a horizontal curve to the right, but drifted from its lane to the left.