A government investigation is underway into a deadly crash. Two pilots were killed when an Air Canada jet hit a fire truck on a runway. The incident occurred at night and involved a series of unusual flights, as well as an emergency on the ground.

Details about the crash are still emerging, but it is known that two air traffic controllers left their posts early that night. Their early departure meant there were fewer staff available to handle the situation.

Further information about the incident and the investigation can be found through other sources, including a government official familiar with the matter.