Official: Electrical issue possibly started ambulance fire

A fire official says an electrical problem with one of the vehicles most likely caused three ambulances parked at a company lot in Inwood to catch fire on May 2, 2014. Firefighters were cautious because of highly flammable oxygen tanks on each of the ambulances and three of those tanks exploded, taking off the roofs of each of the vehicles. (Credit: Jim Staubitser)