At least four workers were killed and 15 others injured in a massive explosion at a ship-breaking yard Saturday morning in Bangladesh's Chittagong district, around 242 kms southeast of capital Dhaka. The private news agency UNB quoted local sources as saying the death toll in the explosion 'may rise further', as some were fighting for life. Police and witnesses said a boiler at Rahim Ship-breaking and Steel Yard Limited 'suddenly burst into flames' at about 10:30 am local time while the workers were cutting a ship named 'A-gate', killing 4 of them on the spot and injuring 15 others. Police rushed in and cordoned off the area. The injured were admitted to local health complex and different clinics. According to local media report, more than 30 ship breakers were killed since 2006 in Bangladesh in different accidents which were reportedly caused by lacking proper regulatory measures. Statistics said some 200,000 workers directly and indirectly are engaged in 40 ship scrapping yards in Bangladesh's ship breaking industry. Enitem 