Tulare County and Visalia Fire Departments are investigating a hazardous materials incident near Pixley, fire officials say.
The Fire Department says they are investigating unknown substances in the back of a box truck which was impounded by CHP on Monday.
The roads around the 500 block of Cedar are closed while firefighters investigate the incident.
Firefighters are asking the public to avoid the area unitl further notice.
Yourcentralvalley.com will update this story when more details are released.