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A major fire broke out after an explosion inside a boiler of a chemicals factory in Maharashtra's Palghar district last night, killing three people and injuring 13 others, police said. The incident took place at Ramdeo Chemicals in the Boisar-Tarapur industrial estate. The fire engulfed the factory around 11.40 pm yesterday after a massive explosion inside a boiler, a senior police official said. The impact of the blast was felt in villages around 8 km away from the factory, he said.