The City of Norwalk Fire Department along with the Westport Fire Department responded to a tractor trailer fire Thursday. March 26 at 7:28 pm.  The fire was on I95 South between exits 17 and 16.  Firefighters arrived to a fully loaded tractor trailer with the tractor portion fully involved.  Firefighters were able to quickly extinguish the fire, preventing extension to the trailer portion.  There were no reported injuries.  The cause of the fire is undetermined.