Visakhapatnam, Apr 28 (ANI): A massive fire that engulfed a bio-diesel manufacturing unit at Duvvada Special Economic Zone continues to rage in Visakhapatnam. Over 40 fire tenders are still battling the Duvvada inferno at Biomax Fuels Limited. A total of 18 diesel tanks were present at the unit, of which 12 tanks blasted and continue to burn. No casualties have been reported so far, as the blaze occurred in the storage area where nobody was present in close proximity.