1 5 PTIADVERTISEMENTAt least four persons were killed and 56 injured following an explosion and major fire at a chemical factory in Maharashtra's Thane district. A major fire broke out after a boiler exploded at Amudan Chemical Company located in Phase 2 of Dombivli MIDC area around 1.40 pm. The impact of the explosion and resultant fire affected at least five companies in the area. Chief Minister Eknath Shinde has announced that the government will bear the expenses of the treatment of the injured persons, Samant said. 4 5 X / @volcaholic1The blast was so loud that it was heard a kilometre away, an eyewitness said.