The emergency response to a hazardous spill and collision on Interstate 10 in February revealed a major breakdown in communication among agencies involved, according to a Pima County preliminary report on the multiagency response.

On the afternoon of Feb. 14, a portion of I-10 in Tucson was shut down after a commercial tanker, belonging to Landstar Inway Inc., hauling a box trailer rolled over in a median and began to leak nitric acid.

The Tucson Fire Department had tweeted the hazardous material was nitric acid, described by the Centers for Disease Control and Prevention as a highly corrosive material that can irritate one's skin, eyes and mucous membranes if exposed.

Five emergency alerts were sent out informing the public within Pima County of the incident, to shelter in place and to avoid the area.