The cause of the vehicle stall was an EPA mandated device meant to reduce diesel emissions. If the emissions toxicity gets too high warning lights start blinking and if not corrected, the device turns off the engine.
Another ambulance was dispatched to offload the passenger from the disabled vehicle, but that caused a delay. The injured person, Nathaniel McRae, 34, who was shot by D.C. police, was dead by the time the second ambulance arrived at Howard University Hospital.
