A "glitch" in an emissions control system forced a D.C. ambulance to shut down.
Which would generally be a non-story, except that they were transporting a gunshot victim to the hospital at the time.
A malfunction in a fail-safe system designed to assure compliance with federally mandated diesel emissions standards forced a D.C. ambulance to shut down on Interstate 295 while its crew transported a gravely injured gunshot victim Wednesday.
The issue is currently under investigation. They're not sure if it was user error, a failure to deliver early alerts about the state of the engine, or something else entirely that caused the shutdown.
Whatever the final determination is... I would suggest that allowing any automated system to force the shutdown of an emergency vehicle or system is a Bad Idea (TM). When you get right down to it, this is precisely why smart guns, aren't.