> In audio from the air traffic control tower at LaGuardia, a staff member can be heard saying: "'Truck One, stop, stop, stop!" in the seconds before the crash.
It sounds to me like either the Cop or the Firefighter (whichever was driving) wasn't listening to ATC and this whole incident was probably completely avoidable.
EDIT: a video of the crash seems to have warning lights that the emergency vehicle ignored.