The debris field was spread out over a couple of miles , Brough said . Three people were killed Saturday in a midair collision over Boulder , Colorado . One of the planes was towing a glider , Boulder County Sheriff 's Department says . The pilot and passenger died when their plane collided with another aircraft at about 10,000 feet above sea level.
Three people were killed Saturday in a midair collision over Boulder , Colorado . One of the planes was towing a glider , Boulder County Sheriff 's Department says . The pilot and passenger died when their plane collided with another aircraft at about 10,000 feet above sea level.