A series of 12 cylinder blasts caused after a fire broke out at Orex Pharmaceuticals, a vitamin manufacturing unit, rocked Shil Phata at Kalyan around 12.05 am on Thursday.

While eight workers who were present at the unit managed to escape the compound in time, Shivkumar Vishwakarma, an 18-year-old labourer sustained severe burns and was admitted to Thakur Multispeciality hospital.