There's still no word on what chemicals were involved in a late afternoon explosion and fire at the Multi-Chem plant in New Iberia. Company officials confirmed last night that there were no injuries.  The blast occurred in a storage facility and forced a one-mile evacuation of the surrounding area.  For safety reasons State Police report crews let the fire burn itself out.The evacuated area includes two other local businesses, the University of Louisiana New Iberia Research Center (NIRC), and the New Iberia Airport. The airport is currently closed and the NIRC remains evacuated as well as a one mile radius around where the explosion occured.