Warning: The video shows the moment of impact from a distance.
DENVER -- Surveillance video at Denver International Airport captured the school bus crash that killed the driver, and injured several coaches and football players from Broomfield last month.
Kari Chopper, 43, was driving a school bus for Legacy High School when she crashed Sept. 11.
The bus was part of a convoy that was returning the varsity and junior varsity football teams to the school after a trip to Southern California for games. Eighteen others -- 15 players and three coaches -- aboard were injured.
The bus had no signs of mechanical issues, the Denver Police Department said.
Chopper's husband, Josh Chopper, said after the crash that his wife had no existing medical conditions, and she did not use drugs or alcohol.
An autopsy on Chopper confirmed she had no drugs or alcohol in her system. The coroner's report indicated she might have had a medical episode before the crash, but the cause of death was blunt force injuries.
"Of note, a natural event such as cardiac arrhythmia or syncopal episode may have occurred prior to the crash; however this cannot be confirmed with any degree of certainty," the report said. "With the information available to us at this time, the manner of death, in our opinion, is accident."